A013127 Expansion of e.g.f.: sec(tanh(x)+log(x+1))=1+4/2!*x^2-6/3!*x^3+83/4!*x^4-460/5!*x^5...

1, 0, 4, -6, 83, -460, 5374, -52962, 711833, -9731160, 156311784, -2676262710, 50867352939, -1037096208564, 22896291533210, -539916293280210, 13603842760270129, -363832977079307248, 10308592491205055532

Offset

0,3

Links

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

Mathematica

With[{nn=20}, CoefficientList[Series[Sec[Tanh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Feb 27 2023 *)

Crossrefs

Sequence in context: A058163 A303211 A264374 * A012970 A196814 A213335

Adjacent sequences: A013124 A013125 A013126 * A013128 A013129 A013130

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Feb 27 2023

Status

approved