OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..2000
N. J. A. Sloane, Euler transform
FORMULA
G.f.: Sum_{n>=1} moebius(n)*log(1 + 3*x^n)/n, where moebius(n)=A008683(n). - Paul D. Hanna, Oct 13 2010
PROG
(PARI) {a(n)=polcoeff(sum(k=1, n, moebius(k)/k*log(1+3*x^k+x*O(x^n))), n)} \\ Paul D. Hanna, Oct 13 2010
CROSSREFS
KEYWORD
sign
AUTHOR
Christian G. Bower, Jan 04 1999
STATUS
approved