OFFSET
0,4
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..10000
FORMULA
a(n) ~ c * exp(r*sqrt(n)) / n^(3/4), where r = 2*sqrt(-polylog(2,-2)) and c = (-polylog(2,-2))^(1/4) / (6*sqrt(3*Pi)).
MATHEMATICA
nmax = 60; CoefficientList[Series[Product[1 + x^k + x^(k+2), {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Jun 25 2021
STATUS
approved