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A129277
Column 1 of triangle A129276; a(n) is the coefficient of q^n in the squared q-factorial of n+1.
2
1, 2, 8, 42, 241, 1444, 8867, 55320, 349009, 2220242, 14215521, 91487834, 591285123, 3834960060, 24947236547, 162704291214, 1063516446543, 6965286759424, 45696734431169, 300262228345720, 1975679169075314
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
Sequence in context: A114204 A366238 A357402 * A120916 A133417 A235350
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 07 2007
STATUS
approved