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A024284 Expansion of sin(x)*sin(tanh(x))/2. 0
0, 1, -8, 144, -4960, 270592, -21137408, 2224725888, -302627860480, 51593676611584, -10764002330353664, 2695943436451381248, -797890777835475828736, 275364493447731494551552, -109570026970391274539712512, 49780238650264282725443174400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..15.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sin[x]*Sin[Tanh[x]]/2, {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Sep 24 2012 *)

CROSSREFS

Cf. A009549.

Sequence in context: A275867 A124059 A052764 * A024285 A111687 A231851

Adjacent sequences:  A024281 A024282 A024283 * A024285 A024286 A024287

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

Two more terms (a(14) & a(15)) from Harvey P. Dale, Sep 24 2012

STATUS

approved

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Last modified October 23 21:08 EDT 2018. Contains 316541 sequences. (Running on oeis4.)