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A012128 arcsinh(arcsin(tanh(x)))=x-2/3!*x^3+24/5!*x^5-776/7!*x^7+49536/9!*x^9... 0
1, -2, 24, -776, 49536, -5271936, 842846848, -188826614016, 56431158829056, -21687384462233600, 10419278733341491200, -6118220781221123260416, 4311116228906909580820480, -3590017073187013127497383936 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcSinh[ArcSin[Tanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Aug 03 2021 *)

CROSSREFS

Sequence in context: A338188 A274634 A292694 * A099704 A265879 A339946

Adjacent sequences:  A012125 A012126 A012127 * A012129 A012130 A012131

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified October 16 23:55 EDT 2021. Contains 348048 sequences. (Running on oeis4.)