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A038067 Product_{k>=1} (1 + x^k)^a(k) = 1 + 2x. 7
2, -1, 2, -4, 6, -9, 18, -34, 56, -99, 186, -344, 630, -1161, 2182, -4114, 7710, -14532, 27594, -52476, 99858, -190557, 364722, -699214, 1342176, -2580795, 4971008, -9587556, 18512790, -35790267, 69273666, -134219794, 260300986 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..3000

N. J. A. Sloane, Weigh transform

FORMULA

Dirichlet convolution of A038063 with characteristic function of powers of 2.

a(n) = 1/n*(-(-2)^n + Sum_{d<n and d divides n} (-1)^(n/d)*d*a(d)). - Vladeta Jovovic, Sep 06 2002

CROSSREFS

Cf. A038063-A038070.

Sequence in context: A305056 A112179 A058553 * A136102 A279586 A275762

Adjacent sequences:  A038064 A038065 A038066 * A038068 A038069 A038070

KEYWORD

sign

AUTHOR

Christian G. Bower, Jan 04 1999

STATUS

approved

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Last modified October 16 10:09 EDT 2018. Contains 316262 sequences. (Running on oeis4.)