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A009298
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Expansion of e.g.f.: exp(x)/cosh(tanh(x)).
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1
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1, 1, 0, -2, 8, 56, -216, -2344, 12032, 168640, -1075328, -18467712, 140944000, 2863703168, -25464568832, -597301399296, 6065774456832, 161295676067840, -1842040163078144, -54752864215838720, 694620312112857088
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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=30}, CoefficientList[Series[Exp[x]/Cosh[Tanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 26 2013 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Jun 26 2013
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STATUS
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approved
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