A012762 Expansion of e.g.f.: sec(cosh(x)*log(x+1))=1+1/2!*x^2-3/3!*x^3+28/4!*x^4-160/5!*x^5...

1, 0, 1, -3, 28, -160, 1510, -13860, 162188, -2015928, 28741220, -442050620, 7490417768, -136676535840, 2694128185424, -56789020808520, 1278027412615632, -30539597036104512, 772903901239459408

Offset

0,4

Links

Table of n, a(n) for n=0..18.

Mathematica

With[{nn=20}, CoefficientList[Series[Sec[Cosh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 27 2018 *)

Crossrefs

Sequence in context: A095665 A145346 A184440 * A012778 A302522 A303405

Adjacent sequences: A012759 A012760 A012761 * A012763 A012764 A012765

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Jun 27 2018

Status

approved