A009165 - OEIS

A009165

Expansion of cosh(tan(x)*sinh(x)).

1, 0, 12, 360, 14672, 947520, 89973312, 11518066560, 1887213285632, 383583690823680, 94596308487109632, 27811060234433710080, 9605125245736932134912, 3848453455438561596456960

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Cosh[Tan[x]*Sinh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 14 2020 *)

CROSSREFS

Sequence in context: A009079 A012379 A012424 * A012627 A012384 A012429

Adjacent sequences: A009162 A009163 A009164 * A009166 A009167 A009168

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested Mar 15 1997 by Olivier Gérard.

Previous Mathematica program replaced by Harvey P. Dale, Aug 14 2020

STATUS

approved