OFFSET
0,12
PROG
(PARI) my(N=99, x='x+O('x^N)); Vec(sum(k=0, N, (-1)^k*x^(k*(3*k+1)/2)/prod(j=1, k, 1-x^j)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jan 12 2022
STATUS
approved