A076723 - OEIS

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A076723

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

2

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

(list; graph; refs; listen; history; text; internal format)

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