login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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
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
Sequence in context: A305056 A112179 A058553 * A136102 A366883 A306810
KEYWORD
sign
AUTHOR
Christian G. Bower, Jan 04 1999
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 07:36 EDT 2024. Contains 370957 sequences. (Running on oeis4.)