A012677 sin(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+200/6!*x^6+1024/8!*x^8...

2, -16, 200, 1024, -765152, 142708480, -27846619008, 6367245656064, -1746851978927616, 576681176370802688, -228223153506206857216, 107581169796591942238208, -59934829639539220412555264

Offset

0,1

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Sin[Tanh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Nov 24 2015 *)

Crossrefs

Sequence in context: A334237 A356585 A012683 * A158212 A300456 A370326

Adjacent sequences: A012674 A012675 A012676 * A012678 A012679 A012680

Keyword

sign

Author

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

Status

approved