A012714 E.g.f.: cos(arctanh(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-31/4!*x^4-140/5!*x^5...

1, 0, -1, -6, -31, -140, -625, -2170, -2623, 96072, 1642975, 23520882, 295668001, 3935469564, 50912723823, 723034935870, 10169862858113, 159490471907856, 2472265829827775, 43176564012771434

Offset

0,4

Links

Table of n, a(n) for n=0..19.

Mathematica

With[{nn=30}, CoefficientList[Series[Cos[ArcTanh[x]Exp[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Jan 15 2013 *)

Crossrefs

Sequence in context: A079924 A009076 A291396 * A094951 A099621 A291002

Adjacent sequences: A012711 A012712 A012713 * A012715 A012716 A012717

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Jan 15 2013

Status

approved