OFFSET
0,5
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..1000 (terms 0..100 from Seiichi Manyama)
FORMULA
a(n) ~ (-1)^n * c * d^n / sqrt(n), where d = 3.31585574856163070436... and c = 0.20250147602443379616... - Vaclav Kotesovec, Apr 17 2017
a(n) = [x^n] exp(n*Sum_{k>=1} (-1)^k*x^k/(k*(1 - x^k)^2)). - Ilya Gutkovskiy, May 30 2018
MATHEMATICA
nmax = 30; Table[SeriesCoefficient[Product[1/(1 + x^k)^(m*k), {k, 1, m}], {x, 0, m}], {m, 0, nmax}] (* Vaclav Kotesovec, Apr 17 2017 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Apr 13 2017
STATUS
approved