A009604 - OEIS

A009604

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

1, 0, 12, 280, 11536, 703296, 59653440, 6715007104, 967972497664, 173764741920768, 37986612815698944, 9929613975171315712, 3056815269626584895488, 1094148286150918628229120

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OFFSET

0,3

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^50); 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: A295528 A166337 A183767 * A154669 A079519 A377549

Adjacent sequences: A009601 A009602 A009603 * A009605 A009606 A009607

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested by Olivier Gérard, Mar 15 1997

STATUS

approved