OFFSET
0,3
FORMULA
a(n) ~ sqrt(3) * exp(sqrt(3*n)*Pi/2) / (16*n).
MATHEMATICA
nmax = 50; CoefficientList[Series[Product[((1+x^(4*k))/(1-x^k)), {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Apr 19 2017
STATUS
approved