OFFSET
0,4
FORMULA
a(0) = 1; a(n) = (2/n) * Sum_{k=1..n} A050452(k) * a(n-k).
a(n) ~ Pi^(3/2) * exp(Pi*sqrt(n/3)) / (2*sqrt(3) * Gamma(1/4)^2 * n). - Vaclav Kotesovec, Jun 25 2024
MATHEMATICA
nmax = 65; CoefficientList[Series[Product[1/(1 - x^(4 k - 1))^2, {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jun 25 2024
STATUS
approved