A012955 tanh(tan(x)+arcsin(x))=2*x-13/3!*x^3+297/5!*x^5-14159/7!*x^7...

2, -13, 297, -14159, 1160001, -145101559, 25744031185, -6148333270639, 1901959189083393, -739758301216077031, 353356041582793698193, -203342136439150617071903, 138755544150262881446540993

Offset

0,1

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]+ArcSin[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 09 2017 *)

Crossrefs

Sequence in context: A126742 A013051 A351022 * A357342 A011808 A011841

Adjacent sequences: A012952 A012953 A012954 * A012956 A012957 A012958

Keyword

sign

Author

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

Status

approved