A303991 Row sums of triangle A303990.
1, 18, 804, 70980, 10436805, 2303750526, 712510404592, 294018013725192, 156070751204023425, 103597044789173411410, 84072367255899882570876, 81892130447332894817380044, 94289343231845338982163322837, 126676207083751543195799431746150, 196394200592428254386554058525461440
Offset: 1
Links
- Seiichi Manyama, Table of n, a(n) for n = 1..214
Programs
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Mathematica
Total /@ Table[n^k k^n, {n, 15}, {k, n}] (* Michael De Vlieger, May 24 2018 *) -
PARI
a(n) = sum(k=1, n, n^k * k^n); \\ Michel Marcus, May 25 2018
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