A012707 Expansion of e.g.f.: sec(arctanh(x)*log(x+1))=1+12/4!*x^4-60/5!*x^5+570/6!*x^6-3780/7!*x^7...

1, 0, 0, 0, 12, -60, 570, -3780, 46368, -471744, 6857160, -89514480, 1475800392, -23440985568, 439465502112, -8219543623200, 173360899246848, -3717086730616704, 87324245398685376

Offset

0,5

Links

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

Mathematica

With[{nn=20}, CoefficientList[Series[Sec[ArcTanh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 20 2021 *)

Crossrefs

Sequence in context: A009163 A012706 A012359 * A355671 A108096 A056388

Adjacent sequences: A012704 A012705 A012706 * A012708 A012709 A012710

Keyword

sign

Author

Patrick Demichel

Extensions

Definition (Name) clarified by Harvey P. Dale, Jun 20 2021

Status

approved