A009607 Expansion of e.g.f. sinh(tan(x))/cos(x), odd powers only.

1, 6, 92, 2688, 127312, 8850336, 845380928, 105911556096, 16814357324032, 3294279618252288, 779927283014454272, 219346023009485242368, 72245888404549697916928, 27535159087648660044718080, 12019428370649765064698642432, 5955630440267924458161515003904

Offset

0,2

Links

G. C. Greubel, Table of n, a(n) for n = 0..239

Mathematica

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

Prog

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

Crossrefs

Sequence in context: A278683 A280214 A113266 * A009684 A221080 A009527

Adjacent sequences: A009604 A009605 A009606 * A009608 A009609 A009610

Keyword

nonn

Author

R. H. Hardin

Extensions

Extended and signs tested by Olivier Gérard, Mar 15 1997

Status

approved