A062812 a(n) = Sum_{i=1..n} i^(n - i) + (-1)^(n - i)*(n - i)^i.

1, 1, 5, 9, 25, 65, 205, 713, 2753, 11425, 50389, 234825, 1155817, 6009153, 32958173, 190115849, 1148816017, 7244099617, 47521750501, 323632894729, 2284774880441, 16702573959489, 126299702576365, 986688266888777

Offset: 1

Author

Olivier Gérard, Jun 23 2001

Keywords

• nonn
• easy

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..600

Crossrefs

Cf. A062810, A062811.

Programs

Mathematica

Sum[i^(n - i) + (-1)^(n - i)*(n - i)^i, {i, 1, n}]

PARI

a(n) = sum(i=1, n, i^(n-i) + (-1)^(n-i)*(n-i)^i); \\ Michel Marcus, Mar 24 2019