OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
PROG
(PARI) N=99; x='x+O('x^N); Vec(prod(k=1, N, ((1-x^k)/(1+x^k))^sigma(k, 2)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Oct 25 2018
STATUS
approved