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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...
0
1, 0, 0, 0, 12, -60, 570, -3780, 46368, -471744, 6857160, -89514480, 1475800392, -23440985568, 439465502112, -8219543623200, 173360899246848, -3717086730616704, 87324245398685376
OFFSET
0,5
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
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition (Name) clarified by Harvey P. Dale, Jun 20 2021
STATUS
approved