OFFSET
1,2
FORMULA
E.g.f.: Sum_{k>=1} mu(k) * log(1 + arctan(x^k)) / k.
MATHEMATICA
nmax = 23; CoefficientList[Series[Sum[MoebiusMu[k] Log[1 + ArcTan[x^k]]/k, {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]! // Rest
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, May 17 2022
STATUS
approved