OFFSET
1,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..598
FORMULA
G.f.: Sum_{k>=1} mu(k) * x^k / (1 - k*x).
MATHEMATICA
a[n_] := Sum[MoebiusMu[k] * k^(n-k), {k, 1, n}]; Array[a, 30] (* Amiram Eldar, May 19 2021 *)
PROG
(PARI) a(n) = sum(k=1, n, moebius(k)*k^(n-k));
(PARI) my(N=40, x='x+O('x^N)); Vec(sum(k=1, N, moebius(k)*x^k/(1-k*x)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, May 19 2021
STATUS
approved