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A024273 Expansion of sin(tanh(x))*x/2. 0
0, 1, -6, 111, -3836, 208205, -16162146, 1691108251, -228856755640, 38843134101081, -8072581315789950, 2015026740164435591, -594586585293174554676, 204653655148187534506789 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sin[Tanh[x]]*x/2, {x, 0, nn}], x] Range[ 0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 25 2020 *)

CROSSREFS

Cf. A009525.

Sequence in context: A112499 A272391 A197765 * A024274 A162081 A296949

Adjacent sequences:  A024270 A024271 A024272 * A024274 A024275 A024276

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

Previous Mathematica program replaced by Harvey P. Dale, Aug 25 2020

STATUS

approved

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Last modified September 17 09:00 EDT 2021. Contains 347478 sequences. (Running on oeis4.)