OFFSET
1,5
FORMULA
Product_{n>=1} 1 / (1 - x^n)^(a(n)/n!) = 1 + Sum_{n>=1} x^n/n.
E.g.f.: Sum_{k>=1} mu(k) * log(1 - log(1 - x^k)) / k.
MATHEMATICA
nmax = 22; CoefficientList[Series[Sum[MoebiusMu[k] Log[1 - Log[1 - x^k]]/k, {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]! // Rest
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, May 15 2022
STATUS
approved