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A009822
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Expansion of tanh(tanh(x)*exp(x)).
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1
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0, 1, 2, -1, -28, -123, 182, 7667, 54280, -145239, -7508758, -69740537, 300239084, 17444352109, 197525621022, -1252976775365, -79313336380656, -1042490265261103, 9235164337672658, 623118827676161167
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OFFSET
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0,3
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..200
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MATHEMATICA
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Tanh[ Tanh[ x ]*Exp[ x ] ]
With[{nn = 50}, CoefficientList[Series[Tanh[Tanh[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Vincenzo Librandi, Apr 11 2014 *)
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CROSSREFS
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Sequence in context: A012415 A012660 A015155 * A246909 A249269 A245621
Adjacent sequences: A009819 A009820 A009821 * A009823 A009824 A009825
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin, Simon Plouffe
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STATUS
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approved
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