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A009254
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Expansion of exp(tan(x)/cosh(x)).
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4
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1, 1, 1, 0, -3, 12, 117, 336, -903, -2096, 111529, 1043328, 687093, -29488704, 320199453, 8894706432, 44530596081, -389860902656, 254346923089, 170568226222080, 2006766293627373, -6327905330549760, -141849542553657147
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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=30}, CoefficientList[Series[Exp[Tan[x]/Cosh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 07 2018 *)
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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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STATUS
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approved
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