A303991 Row sums of triangle A303990.

1, 18, 804, 70980, 10436805, 2303750526, 712510404592, 294018013725192, 156070751204023425, 103597044789173411410, 84072367255899882570876, 81892130447332894817380044, 94289343231845338982163322837, 126676207083751543195799431746150, 196394200592428254386554058525461440

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

Cf. A303990, A368505.

Sequence in context: A259458 A180781 A264468 * A033471 A128074 A049655

Adjacent sequences: A303988 A303989 A303990 * A303992 A303993 A303994

Keyword

nonn,easy

Author

Wolfdieter Lang, May 22 2018

Status

approved