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A012440 arctanh(arctan(x)*arcsin(x))=2/2!*x^2-4/4!*x^4+398/6!*x^6-10344/8!*x^8... 0
0, 2, -4, 398, -10344, 2050362, -188329260, 60987377670, -12776749381200, 6138167322301170, -2341662552659308500, 1574696831249089102590, -954442874464228447345080, 862598218425468174866650410 (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[ArcTanh[ArcTan[x]*ArcSin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Ray Chandler, Nov 28 2016 *)

CROSSREFS

Sequence in context: A216024 A247220 A012753 * A058172 A122808 A294225

Adjacent sequences:  A012437 A012438 A012439 * A012441 A012442 A012443

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 18 15:59 EDT 2022. Contains 353816 sequences. (Running on oeis4.)