A354064 - OEIS

A354064

Product_{n>=1} 1 / (1 - x^(2*n))^(a(n)/(2*n)!) = cosh(x).

1, -8, -104, 1408, -354944, 47546368, -6204652544, 68669145088, -47215125069824, 159504062197792768, -51085990673656315904, -6994033618612756938752, -15510963121850795776016384, 14479308135716773591282352128, 7469518701197092988127633473536, 11962377309169877924807975108608

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

FORMULA

E.g.f.: Sum_{k>=1} mu(k) * log(cosh(x^k)) / k (even powers only).

MATHEMATICA

nmax = 32; Take[CoefficientList[Series[Sum[MoebiusMu[k] Log[Cosh[x^k]]/k, {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]!, {1, -1, 2}] // Rest

CROSSREFS

Cf. A353609, A354055, A354056, A354063, A354065, A354066.

Sequence in context: A109774 A001657 A282185 * A106260 A112121 A141383

Adjacent sequences: A354061 A354062 A354063 * A354065 A354066 A354067

KEYWORD

sign

AUTHOR

Ilya Gutkovskiy, May 16 2022

STATUS

approved