A009588 Expansion of e.g.f. sinh(sin(tan(x))), odd powers only.

1, 2, 8, -232, -25600, -2258048, -212565376, -21159275264, -1935285600256, -49976214294528, 63805712413261824, 35001400723765723136, 14864146970063529476096, 5873322147682909938319360, 2179283235919329416585674752, 684206903818546691477749366784

Offset

0,2

Links

G. C. Greubel, Table of n, a(n) for n = 0..237

Mathematica

With[{nmax = 50}, CoefficientList[Series[Sinh[Sin[Tan[x]]], {x, 0, nmax}], x]*Range[0, nmax - 1]!][[2 ;; ;; 2]] (* G. C. Greubel, Jan 30 2018 *)

Prog

(PARI) x='x+O('x^40); v=Vec(serlaplace(sinh(sin(tan(x))))); vector((#v-1)\2 , n, v[2*n-1]) \\ G. C. Greubel, Jan 30 2018

Crossrefs

Sequence in context: A013347 A013344 A091503 * A338543 A125264 A028985

Adjacent sequences: A009585 A009586 A009587 * A009589 A009590 A009591

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved