A012439 tanh(arctan(x)*arcsin(x))=2/2!*x^2-4/4!*x^4-82/6!*x^6+3096/8!*x^8...

2, -4, -82, 3096, 14202, -4057260, 614585190, 65252737200, 9930277245810, 3938676912038700, 2327811184268315550, 661470912900859782600, 625005810716811201651690, 275157523021831158684027780

Offset

0,1

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcTan[x]ArcSin[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Apr 05 2019 *)

Crossrefs

Sequence in context: A102663 A322704 A076961 * A012435 A121103 A018397

Adjacent sequences: A012436 A012437 A012438 * A012440 A012441 A012442

Keyword

sign

Author

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

Status

approved