A012898 Expansion of e.g.f.: sech(sin(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+69/4!*x^4-330/5!*x^5...

1, 0, -4, 6, 69, -330, -2604, 29757, 143689, -3993444, -5337254, 737504515, -2332694727, -175190250378, 1654468461772, 50077708127475, -960691803929007, -15733047012443176, 589399300515721526

Offset

0,3

Links

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

Mathematica

With[{nn=20}, CoefficientList[Series[Sech[Sin[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Oct 01 2023 *)

Crossrefs

Sequence in context: A363861 A189790 A053489 * A013080 A322150 A319264

Adjacent sequences: A012895 A012896 A012897 * A012899 A012900 A012901

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Oct 01 2023

Status

approved