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A012779
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Expansion of e.g.f.: sech(sec(x)*log(x+1))=1-1/2!*x^2+3/3!*x^3-18/4!*x^4+60/5!*x^5...
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0
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1, 0, -1, 3, -18, 60, -180, -1050, 24192, -308952, 3131760, -23742840, 62587272, 2606501040, -75839636600, 1415140435800, -20144425867712, 187207018203392, 730860552463104, -93674690778135744
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Sech[Sec[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Apr 17 2016 *)
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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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