A013147 arcsinh(tanh(x)+arctan(x))=2*x-12/3!*x^3+488/5!*x^5-55552/7!*x^7...

2, -12, 488, -55552, 12546944, -4711567872, 2650074624000, -2084720933010432, 2185097305985613824, -2943182792681798926336, 4953485656236312191369216, -10186669183126638973192372224

Offset

0,1

Links

Table of n, a(n) for n=0..11.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcSinh[Tanh[x]+ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jun 17 2015 *)

Crossrefs

Sequence in context: A012625 A012630 A013173 * A250110 A266501 A264952

Adjacent sequences: A013144 A013145 A013146 * A013148 A013149 A013150

Keyword

sign

Author

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

Status

approved