OFFSET
0,10
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..1000
MAPLE
with(numtheory):
seq(coeff(series(mul(1-x^sigma(k), k=1..n), x, 90), x, n), n=0..80); # Muniru A Asiru, May 31 2018
PROG
(PARI) N=99; x='x+O('x^N); Vec(prod(k=1, N, 1-x^sigma(k)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, May 30 2018
STATUS
approved