OFFSET
0,3
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) = 0.4304067090888734207149852218007129877370867778815471457548443780472...
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