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A013080
Expansion of e.g.f.: sech(arcsinh(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+69/4!*x^4-330/5!*x^5...
0
1, 0, -4, 6, 69, -330, -2700, 29925, 164745, -4116420, -9894150, 791943075, -1224167175, -199738989450, 1368120253500, 62416549069875, -901935831171375, -22756961540313000, 604804116364197750
OFFSET
0,3
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Sech[ArcSinh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 23 2021 *)
CROSSREFS
Sequence in context: A189790 A053489 A012898 * A322150 A319264 A013128
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, May 23 2021
STATUS
approved