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A354065
Product_{n>=1} 1 / (1 - x^n)^(a(n)/n!) = 1 + tan(x).
7
1, -2, 2, -8, 56, -496, 3184, -22784, 273920, -4539136, 48104704, -506000384, 10591523840, -204528633856, 2888557717504, -53417657237504, 1249919350046720, -28453501844586496, 624022403933077504, -13729309300086800384, 372737701735949926400, -11010228423219933085696
OFFSET
1,2
FORMULA
E.g.f.: Sum_{k>=1} mu(k) * log(1 + tan(x^k)) / k.
MATHEMATICA
nmax = 22; CoefficientList[Series[Sum[MoebiusMu[k] Log[1 + Tan[x^k]]/k, {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]! // Rest
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, May 16 2022
STATUS
approved