OFFSET
0,2
FORMULA
a(n) ~ exp(n) * n^(2*n - 1/2) / sqrt(2*Pi).
MATHEMATICA
Table[Sum[Binomial[k^3, k], {k, 0, n}], {n, 0, 20}]
PROG
(PARI) a(n) = sum(k=0, n, binomial(k^3, k)); \\ Michel Marcus, Jan 10 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Jan 10 2023
STATUS
approved