A012739 sin(arctanh(x)*cos(x))=x-2/3!*x^3+20/5!*x^5-16/7!*x^7+14096/9!*x^9...

1, -2, 20, -16, 14096, 887456, 126998976, 21834514688, 5067177011456, 1485621376751104, 540527763829711872, 238770291840873000960, 125924968135743519723520, 78156500138405011699867648

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTanh[x]Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Nov 04 2015 *)

Crossrefs

Sequence in context: A083297 A343927 A221921 * A261753 A075031 A273466

Adjacent sequences: A012736 A012737 A012738 * A012740 A012741 A012742

Keyword

sign

Author

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

Status

approved