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A012873
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Expansion of e.g.f.: arctan(sech(x)*log(x+1))=x-1/2!*x^2-3/3!*x^3+12/4!*x^4+43/5!*x^5...
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0
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0, 1, -1, -3, 12, 43, -555, -49, 37632, -154867, -3817845, 45540649, 409535148, -12690409929, -14813266559, 3983011043675, -28691304331680, -1331245986549447, 25689766775914647, 419731311262402229
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OFFSET
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1,4
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[ArcTan[Sech[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Aug 14 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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Zero prepended to sequence and definition clarified by Harvey P. Dale, Aug 14 2021
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STATUS
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approved
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