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A012677 sin(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+200/6!*x^6+1024/8!*x^8... 0
2, -16, 200, 1024, -765152, 142708480, -27846619008, 6367245656064, -1746851978927616, 576681176370802688, -228223153506206857216, 107581169796591942238208, -59934829639539220412555264 (list; graph; refs; listen; history; text; internal format)
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: A209586 A334237 A012683 * A158212 A300456 A036081

Adjacent sequences:  A012674 A012675 A012676 * A012678 A012679 A012680

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified June 5 12:47 EDT 2020. Contains 334840 sequences. (Running on oeis4.)