A383010 a(n) = -Sum_{d|n} (-n)^d.

1, -2, 30, -268, 3130, -46470, 823550, -16781368, 387421227, -9999900090, 285311670622, -8916103453380, 302875106592266, -11112006720144694, 437893890381622140, -18446744078004584688, 827240261886336764194, -39346408075098212291754, 1978419655660313589123998

Offset: 1

Author

Seiichi Manyama, Apr 12 2025

Keywords

• sign
• easy

Crossrefs

Cf. A066108, A383003.

Programs

PARI

a(n) = -sumdiv(n, d, (-n)^d);