OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..214
FORMULA
a(n) = Sum_{k=1..n} A303990(n, k) = Sum_{k=1..n} n^k * k^n, for n >= 1.
a(n) ~ n^(2*n). - Vaclav Kotesovec, Feb 09 2022
MATHEMATICA
Total /@ Table[n^k k^n, {n, 15}, {k, n}] (* Michael De Vlieger, May 24 2018 *)
PROG
(PARI) a(n) = sum(k=1, n, n^k * k^n); \\ Michel Marcus, May 25 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, May 22 2018
STATUS
approved