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A012419
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Expansion of e.g.f.: sech(arctan(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-11/4!*x^4+100/5!*x^5...
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0
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1, 0, -1, -6, -11, 100, 995, 2030, -45943, -568632, -1189145, 54818082, 845395901, 1936128428, -142744278261, -2685086733290, -6197620433007, 713212265955216, 15393015776009807, 26780979282600266
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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[ArcTan[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 06 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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