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A013080
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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...
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0
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1, 0, -4, 6, 69, -330, -2700, 29925, 164745, -4116420, -9894150, 791943075, -1224167175, -199738989450, 1368120253500, 62416549069875, -901935831171375, -22756961540313000, 604804116364197750
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Sech[ArcSinh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 23 2021 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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