OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..338
FORMULA
a(n) ~ exp(n - 1/2) * n^(n - 1/2) / sqrt(2*Pi).
MATHEMATICA
Table[Sum[Binomial[k^2, k], {k, 0, n}], {n, 0, 20}]
PROG
(PARI) a(n) = sum(k=0, n, binomial(k^2, k)); \\ Michel Marcus, Jan 10 2019
(Magma) [&+[Binomial(k^2, k): k in [0..n]]: n in [0..20]]; // Vincenzo Librandi, Jan 10 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Nov 27 2017
STATUS
approved