OFFSET
0,2
COMMENTS
Triangle A125806 gives the sum of squared coefficients of q in the corresponding q-binomial coefficients.
PROG
(PARI) {a(n)=sum(k=0, n, sum(i=0, (n-k)*k, polcoeff(if(n==0, 1, prod(j=n-k+1, n, 1-q^j)/prod(j=1, k, 1-q^j)), i)^2))}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 12 2006
STATUS
approved