OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, q-Factorial.
FORMULA
a(n) = [q^n] Product_{i=1..n+1} { (1-q^i)/(1-q) }^2.
PROG
(PARI) a(n)=polcoeff(prod(i=1, n+1, (1-x^i)/(1-x))^2, n)
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 07 2007
STATUS
approved