A013142 arcsin(tanh(x)+arctan(x))=2*x+4/3!*x^3+168/5!*x^5+13248/7!*x^7...

2, 4, 168, 13248, 2226048, 599902208, 243130652672, 137141067373568, 103018549675327488, 99335294756500832256, 119626550900969898049536, 175950984763936427137433600, 310396731889156481163306991616

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-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 16 2014 *)

Crossrefs

Sequence in context: A132528 A018573 A018583 * A023171 A018595 A260900

Adjacent sequences: A013139 A013140 A013141 * A013143 A013144 A013145

Keyword

nonn

Author

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

Status

approved