Q1. THE FIRST ATTENDANCE QUESTION WAS:
Who invented latin squares and latin greco squares and what are those

A1. MY ANSWER TO THE FIRST ATTENDANCE QUESTION IS:
Leonhard Euler
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.
A Graeco-Latin square or Euler square or pair of orthogonal Latin squares of order n over two sets S and T (which may be the same), each consisting of n symbols, is an n × n arrangement of cells, each cell containing an ordered pair (s, t), where s is in S and t is in T, such that every row and every column contains each element of S and each element of T exactly once, and that no two cells contain the same ordered pair.

Q2. THE  SECOND ATTENDANCE QUESTION WAS:
What is nops(AllGraphs(20))

A2. MY ANSWER TO THE  SECOND ATTENDANCE QUESTION IS:
1569275433846670190958947355801916604025588861116008628224


Q3. THE  THIRD ATTENDANCE QUESTION WAS:
What is CC(G,38)

A3. MY ANSWER TO THE  THIRD ATTENDANCE QUESTION IS:
{38}


Q4. THE  FOURTH ATTENDANCE QUESTION WAS:
Is this in the oeis

A4. MY ANSWER TO THE  FOURTH ATTENDANCE QUESTION IS:
A001187


Q5. THE  FIFTH ATTENDANCE QUESTION WAS:
Draw the graph

A5. MY ANSWER TO THE  FIFTH ATTENDANCE QUESTION IS:
8-1-4-6-9-3-5-7-2
            |
            10

Q6. THE  SIXTH ATTENDANCE QUESTION WAS
i. is it in the oeis
ii. what is its a number 
iii.what is the number of trees with 20 vertices

A6. MY ANSWER TO THE  SIXTH ATTENDANCE QUESTION IS
i. yes
ii.A000272
iii.262144000000000000000000


Q7. THE  SEVENTH ATTENDANCE QUESTION WAS
IS IT IN THE OEIS

A7. MY ANSWER TO THE  SEVENTH ATTENDANCE QUESTION IS
A057500


Q8. THE  EIGHTH ATTENDANCE QUESTION WAS
is it in the oeis

A8. MY ANSWER TO THE  EIGHTH ATTENDANCE QUESTION IS
A061540