A012440 arctanh(arctan(x)*arcsin(x))=2/2!*x^2-4/4!*x^4+398/6!*x^6-10344/8!*x^8...

0, 2, -4, 398, -10344, 2050362, -188329260, 60987377670, -12776749381200, 6138167322301170, -2341662552659308500, 1574696831249089102590, -954442874464228447345080, 862598218425468174866650410

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