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A012708
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Expansion of e.g.f.: sech(arctanh(x)*log(x+1))=1-12/4!*x^4+60/5!*x^5-570/6!*x^6...
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0
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1, 0, 0, 0, -12, 60, -570, 3780, -29568, 169344, -557160, -13049520, 375064008, -7823848032, 135678667488, -2221166656800, 32120158935552, -397914002426496, 2522488580207424, 61215640433391744
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OFFSET
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0,5
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Sech[ArcTanh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Apr 23 2023 *)
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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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