OFFSET
0,4
FORMULA
a(n) ~ exp(2*Pi*sqrt(2*n/5)) / (4 * 5^(5/4) * n^(3/2)).
MATHEMATICA
nmax = 40; CoefficientList[Series[Sum[x^(k*(k+1))/Product[1-x^j, {j, 1, k}]^4, {k, 0, Sqrt[nmax]}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Oct 02 2024
STATUS
approved