OFFSET
0,2
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..1000
MATHEMATICA
nmax = 50; CoefficientList[Series[Product[(1 - k*x^k)/(1 + k*x^k), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Jun 09 2018 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Sep 14 2017
STATUS
approved