OFFSET
0,4
COMMENTS
Self-convolution of A006128.
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..10000
FORMULA
a(n) ~ 3^(1/4)*(2*gamma+log(3*n/Pi^2))^2 * exp(2*Pi*sqrt(n/3)) / (16*Pi^2*n^(1/4)), where gamma is the Euler-Mascheroni constant A001620.
MATHEMATICA
nmax = 40; CoefficientList[Series[(Sum[x^k/(1-x^k), {k, 1, nmax}] * Product[1/(1-x^k), {k, 1, nmax}])^2, {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, May 26 2018
STATUS
approved