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A009261
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E.g.f.: Expansion of exp(tanh(tanh(x))).
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0
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1, 1, 1, -3, -15, 33, 513, -403, -31007, -41247, 2881089, 12404989, -376412847, -3175861439, 64825974593, 925805229229, -13951231536191, -320290449542079, 3556538162237313, 131747901365358205, -998391201911168335
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refs;
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history;
text;
internal format)
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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[Tanh[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Apr 08 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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STATUS
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approved
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