OFFSET
0,3
FORMULA
a(n) ~ sqrt(2*Pi) * n^(2*n + 1/2) / (exp(n) * (log(n))^(n+1)). - Vaclav Kotesovec, Dec 28 2023
PROG
(PARI) a(n) = sum(k=0, n, n^(n-k)*k^n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Dec 27 2023
STATUS
approved