OFFSET
0,3
LINKS
Paul D. Hanna, Table of n, a(n), n=0..50.
PROG
(PARI) {a(n)=sum(k=0, n*(n-1)/2, abs(polcoeff(polcoeff(2/(1+sum(m=0, n, (2*x)^m/prod(j=1, m, (q^j-1)/(q-1))+x*O(x^(n+2)))), n, x)*prod(j=1, n, (q^j-1)/(q-1)), k, q)))}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 28 2008
STATUS
approved