A012695 arctan(tanh(x)*arcsinh(x))=2/2!*x^2-12/4!*x^4-50/6!*x^6+14280/8!*x^8...

2, -12, -50, 14280, -826502, -49633540, 25407386758, -3395749736176, -840874377633678, 669385496489774468, -130679263245845309250, -109382532060795384014888, 114810087622932492884439786

Offset

0,1

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcTan[Tanh[x]ArcSinh[x]], {x, 0, nn}], x] Range[ 0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Jun 07 2022 *)

Crossrefs

Sequence in context: A341546 A012423 A012427 * A012382 A198008 A359523

Adjacent sequences: A012692 A012693 A012694 * A012696 A012697 A012698

Keyword

sign

Author

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

Status

approved