A012117 - OEIS

A012117

arcsinh(arcsin(arcsinh(x)))=x-1/3!*x^3+17/5!*x^5-449/7!*x^7+30113/9!*x^9...

1, -1, 17, -449, 30113, -2761793, 415351089, -81370683393, 21955730621249, -7408485122203009, 3161408870916725841, -1630838373598845388097, 1013685573603673847917793, -741353146138643571687256001

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OFFSET

0,3

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcSinh[ArcSin[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Aug 07 2017 *)

CROSSREFS

Sequence in context: A301642 A035022 A375891 * A271438 A371488 A122430

Adjacent sequences: A012114 A012115 A012116 * A012118 A012119 A012120

KEYWORD

sign

AUTHOR

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

STATUS

approved