A024268 - OEIS

A024268

Expansion of tanh(tan(x)*sinh(x))/2.

0, 1, 6, -49, -8484, -511379, 6769026, 9445602011, 1884673497336, 61550034487321, -126825694957538754, -61388922632885893849, -9399026972435828464044, 9252373566488286511114501, 9573652356256569791096427066

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]*Sinh[x]]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Dec 01 2020 *)

CROSSREFS

Cf. A009816.

Sequence in context: A245797 A046195 A305376 * A187528 A187699 A212232

Adjacent sequences: A024265 A024266 A024267 * A024269 A024270 A024271

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

Previous Mathematica program replaced by Harvey P. Dale, Dec 01 2020

STATUS

approved