OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..1000
N. J. A. Sloane, Euler transform
FORMULA
G.f.: Sum_{k>=1} mu(k)*log(1 + 4*x^k)/k. - Ilya Gutkovskiy, May 23 2017
a(n) ~ -(-1)^n * 4^n / n. - Vaclav Kotesovec, Jun 12 2018
PROG
(PARI) x='x+O('x^24); Vec(sum(k=1, 24, moebius(k)*log(1 + 4*x^k)/k)) \\ Indranil Ghosh, May 24 2017
CROSSREFS
KEYWORD
sign
AUTHOR
Christian G. Bower, Jan 04 1999
STATUS
approved