read W1D:
S:={1,2,-3}:
ope:=InfoHss1(S,n,N,40):
if ope=FAIL then
print(ope):
else
print(`The linear recurrence operator annihilating the enumerating sequence of n-step walks with fundamental set of steps`, S):
print(`that start at 0, end anyhwhere on the non-negative integers, and NEVER visit negative integers,`):
print(`in Maple input notation, is ` ):
print(``):
lprint(ope):
print(``):
fi:
print(`This took`, time(), `seconds. `):
quit: