OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
G.f.: Product_{k>0} (1-x^k)^(k*2).
G.f.: exp(-2*Sum_{k>=1} x^k/(k*(1 - x^k)^2)). - Ilya Gutkovskiy, May 30 2018
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Apr 10 2017
STATUS
approved