A013128 Expansion of e.g.f.: sech(tanh(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+77/4!*x^4-340/5!*x^5...

1, 0, -4, 6, 77, -340, -3574, 34062, 278337, -5275800, -28795584, 1159543110, 2472700941, -340042014156, 704790251070, 126778070956110, -958235638366239, -57637006798322672, 866891599173180708

Offset

0,3

Links

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

Mathematica

With[{nn=20}, CoefficientList[Series[Sech[Tanh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jul 11 2018 *)

Crossrefs

Sequence in context: A013080 A322150 A319264 * A012971 A197315 A061216

Adjacent sequences: A013125 A013126 A013127 * A013129 A013130 A013131

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Jul 11 2018

Status

approved