A012129 tanh(arcsin(tanh(x)))=x-3/3!*x^3+41/5!*x^5-1243/7!*x^7+65681/9!*x^9...

1, -3, 41, -1243, 65681, -5335283, 616216121, -95919970123, 19349625251361, -4909180152449763, 1529770153928451401, -574346328696763158203, 255703860384773029976241, -133196988269151890206719443

Offset

0,2

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcSin[Tanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jun 23 2022 *)

Crossrefs

Sequence in context: A012053 A012162 A012225 * A012035 A012016 A207993

Adjacent sequences: A012126 A012127 A012128 * A012130 A012131 A012132

Keyword

sign

Author

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

Status

approved