A076723 Sum_{d divides n} (-d)^d.

-1, 3, -28, 259, -3126, 46632, -823544, 16777475, -387420517, 9999996878, -285311670612, 8916100495144, -302875106592254, 11112006824734476, -437893890380862528, 18446744073726329091, -827240261886336764178, 39346408075296150201567

Offset

1,2

Links

Seiichi Manyama, Table of n, a(n) for n = 1..386

Formula

G.f.: Sum_{n>0} (-n*x)^n/(1-x^n).

Prog

(PARI) a(n) = sumdiv(n, d, (-d)^d); \\ Michel Marcus, Dec 22 2018

Crossrefs

Cf. A062796, A321385.

Sequence in context: A037784 A037588 A307885 * A198887 A026114 A181069

Adjacent sequences: A076720 A076721 A076722 * A076724 A076725 A076726

Keyword

sign

Author

Vladeta Jovovic, Oct 27 2002

Status

approved