OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
G.f.: Product_{k>0} 1/(1 + x^k)^(k*2).
a(n) ~ (-1)^n * exp(-1/6 + 3 * 2^(-4/3) * Zeta(3)^(1/3) * n^(2/3)) * A^2 * Zeta(3)^(1/9) / (2^(11/18) * sqrt(3*Pi) * n^(11/18)), where A is the Glaisher-Kinkelin constant A074962. - Vaclav Kotesovec, Apr 13 2017
G.f.: exp(2*Sum_{k>=1} (-1)^k*x^k/(k*(1 - x^k)^2)). - Ilya Gutkovskiy, Mar 27 2018
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Apr 11 2017
STATUS
approved