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A305320
Expansion of Product_{k>=1} (1 - x^sigma(k)).
3
1, -1, 0, -1, 0, 1, -1, 1, -1, 2, 1, 0, -3, 0, 0, 2, 1, -2, 0, 1, 2, -1, -3, -4, 0, 3, 4, 0, -4, -1, 6, -3, 3, -9, 0, 5, 10, 0, -6, -7, 0, 6, -2, 2, -9, 6, 7, 4, -7, -7, -11, 8, 11, 3, -5, -1, -3, 9, -10, 1, -9, 0, 16, 8, 0, -4, -4, -20, 12, -8, 11, 0, -7, 14, -2
OFFSET
0,10
LINKS
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