OFFSET
0,2
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..3300
FORMULA
a(n) ~ c * (-2)^n, where c = Product_{k>=1} ((-2)^k - k)/((-2)^k - 1) = 0.691544539061740396647761051109300225267201237557458470928297389967...
MATHEMATICA
nmax = 50; CoefficientList[Series[Product[(1-k*x^k)/(1+2*x^k), {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
sign
AUTHOR
Vaclav Kotesovec, Feb 20 2016
STATUS
approved