> #Attendence Q1.
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> #Who invented Latin squares and Latin-Greco squares, and what are there? 
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> #Leonhard Euler. In combinatorics and in experimental design, a Latin square is an n × n array filled with n different symbols, each occurring exactly once in each row and exactly once in each column.
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> 
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> #Attendence Q2.
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> #What is nops(AllGraphs(20))
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> #for nops(AllGraphs(n)), 
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> #n=4->2^6
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> #n=5->2^10
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> #n=6->2^15
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> #n=7->2^21
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> #By conjecture, nops(AllGraphs(20)) = 2^(1+2+...+19) = 2^190
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> 
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> #Attendence Q3.
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> #What is CC(G,38)?
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> G:=RandGr(200,50)
Typesetting:-mprintslash([(G := [{}, {44}, {}, {}, {137}, {}, {}, {}, {}, {}, {
125, 144}, {66}, {53, 61}, {}, {}, {}, {}, {}, {139}, {}, {}, {66}, {198}, {},
{}, {}, {}, {}, {}, {}, {131}, {}, {}, {}, {}, {}, {}, {131}, {}, {}, {}, {192}
, {}, {2}, {}, {}, {}, {}, {}, {}, {}, {169}, {13, 89}, {}, {182}, {}, {}, {},
{}, {130}, {13}, {}, {165}, {}, {}, {12, 22}, {}, {72, 75, 145}, {}, {158}, {},
{68, 128}, {}, {}, {68, 178, 189}, {138, 180}, {}, {}, {}, {172}, {}, {131}, {}
, {157}, {}, {111, 143, 153}, {}, {}, {53, 132, 141}, {130}, {}, {}, {}, {}, {}
, {}, {}, {168}, {}, {167}, {129}, {}, {138}, {}, {141}, {}, {}, {}, {}, {116},
{86}, {}, {146, 155}, {}, {}, {110}, {}, {}, {}, {}, {}, {}, {}, {130, 156}, {
11}, {}, {}, {72}, {101}, {60, 90, 124}, {31, 38, 82}, {89}, {}, {}, {}, {}, {5
}, {76, 103}, {19}, {167}, {89, 105}, {}, {86}, {11, 152}, {68}, {113}, {177},
{}, {}, {}, {}, {144}, {86}, {}, {113}, {124, 172}, {84}, {70}, {}, {}, {}, {},
{}, {}, {63}, {}, {100, 140}, {98}, {52}, {}, {}, {80, 156}, {}, {}, {}, {}, {
147}, {75}, {}, {76}, {}, {55}, {}, {}, {}, {}, {}, {}, {75}, {}, {}, {42}, {},
{}, {}, {}, {}, {23}, {}, {}])],[[{}, {44}, {}, {}, {137}, {}, {}, {}, {}, {},
{125, 144}, {66}, {53, 61}, {}, {}, {}, {}, {}, {139}, {}, {}, {66}, {198}, {},
{}, {}, {}, {}, {}, {}, {131}, {}, {}, {}, {}, {}, {}, {131}, {}, {}, {}, {192}
, {}, {2}, {}, {}, {}, {}, {}, {}, {}, {169}, {13, 89}, {}, {182}, {}, {}, {},
{}, {130}, {13}, {}, {165}, {}, {}, {12, 22}, {}, {72, 75, 145}, {}, {158}, {},
{68, 128}, {}, {}, {68, 178, 189}, {138, 180}, {}, {}, {}, {172}, {}, {131}, {}
, {157}, {}, {111, 143, 153}, {}, {}, {53, 132, 141}, {130}, {}, {}, {}, {}, {}
, {}, {}, {168}, {}, {167}, {129}, {}, {138}, {}, {141}, {}, {}, {}, {}, {116},
{86}, {}, {146, 155}, {}, {}, {110}, {}, {}, {}, {}, {}, {}, {}, {130, 156}, {
11}, {}, {}, {72}, {101}, {60, 90, 124}, {31, 38, 82}, {89}, {}, {}, {}, {}, {5
}, {76, 103}, {19}, {167}, {89, 105}, {}, {86}, {11, 152}, {68}, {113}, {177},
{}, {}, {}, {}, {144}, {86}, {}, {113}, {124, 172}, {84}, {70}, {}, {}, {}, {},
{}, {}, {63}, {}, {100, 140}, {98}, {52}, {}, {}, {80, 156}, {}, {}, {}, {}, {
147}, {75}, {}, {76}, {}, {55}, {}, {}, {}, {}, {}, {}, {75}, {}, {}, {42}, {},
{}, {}, {}, {}, {23}, {}, {}]])

;
> CC(G,38)
{31, 38, 82, 131}
;
> 
;
> #Attendence Q4.
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> #Is this sequence in the OEIS? If it is, what is the A-number? 
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> #Yes. A1187: Number of connected labeled graphs with n nodes.
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> 
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> #Attendence Q5:
> #Draw this graph manully
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> # 8-1-4-6-9-3-5-7-10-2-5
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> 
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> #Attendence Q6:
> #Is this sequence in the OEIS? A-number?
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> #A272: Number of trees on n labeled nodes: n^(n-2) with a(0)=1.
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> 
;
> #Attendence Q7:
> #Is this in the oeis? What is the A-number?
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> #A57500: 	Number of connected labeled graphs with n edges and n nodes.
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> 
;