A012405 Expansion of e.g.f.: cosh(arctan(x)*log(x+1))=1+12/4!*x^4-60/5!*x^5+90/6!*x^6-420/7!*x^7...

1, 0, 0, 0, 12, -60, 90, -420, 15008, -149184, 572040, -4263600, 153746472, -2274880608, 14574976416, -151922927520, 6077379610368, -119360435727744, 1090133783570880, -14675613664063104

Offset

0,5

Links

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

Mathematica

With[{nn=20}, CoefficientList[Series[Cosh[ArcTan[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 22 2019 *)

Crossrefs

Sequence in context: A009093 A012400 A009172 * A012657 A012406 A097191

Adjacent sequences: A012402 A012403 A012404 * A012406 A012407 A012408

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Jun 22 2019

Status

approved