A013292 Expansion of e.g.f.: sec(log(x+1)-tanh(x))=1+3/4!*x^4-40/5!*x^5+250/6!*x^6-1008/7!*x^7...

1, 0, 0, 0, 3, -40, 250, -1008, 6937, -107280, 1460724, -16878400, 198206107, -2751120216, 45257093830, -796023874800, 14139937791153, -259510939790752, 5134675490787400, -109869768885171456

Offset

0,5

Links

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

Mathematica

With[{nn=20}, CoefficientList[Series[Sec[Log[x+1]-Tanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Aug 25 2016 *)

Crossrefs

Sequence in context: A013293 A013286 A013291 * A278379 A181395 A165395

Adjacent sequences: A013289 A013290 A013291 * A013293 A013294 A013295

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Aug 25 2016

Status

approved