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A009607 Expansion of e.g.f. sinh(tan(x))/cos(x), odd powers only. 1
1, 6, 92, 2688, 127312, 8850336, 845380928, 105911556096, 16814357324032, 3294279618252288, 779927283014454272, 219346023009485242368, 72245888404549697916928, 27535159087648660044718080, 12019428370649765064698642432, 5955630440267924458161515003904 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 6 16:34 EDT 2022. Contains 357270 sequences. (Running on oeis4.)