A012678 arcsin(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+440/6!*x^6-25856/8!*x^8...

2, -16, 440, -25856, 2702368, -442400000, 104680527744, -33826438987776, 14318658795815424, -7689929339111084032, 5108988246588765059072, -4113772753950316528205824, 3947181962951541949825294336

Offset

0,1

Links

Table of n, a(n) for n=0..12.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcSin[Tanh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Nov 22 2024 *)

Crossrefs

Sequence in context: A358784 A012030 A012682 * A012146 A113109 A223563

Adjacent sequences: A012675 A012676 A012677 * A012679 A012680 A012681

Keyword

sign

Author

Patrick Demichel

Status

approved