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A009241
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Expansion of e.g.f.: exp(tan(tanh(x))).
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3
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1, 1, 1, 1, 1, -7, -47, -55, 449, 2897, 18209, 5105, -1441087, -7252983, 41192817, 341550201, 2660018305, 43255573537, -460752070079, -11238852308639, 21450325749889, 963068748879257, 1057483104728337, 153386988236833449
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OFFSET
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0,6
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LINKS
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Exp[Tan[Tanh[x]]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Apr 05 2022 *)
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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, Apr 05 2022
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STATUS
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approved
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