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A024231
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Expansion of tanh(tan(x))*sin(x)/2.
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0
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0, 1, -2, -21, -228, 5077, 631834, 37060863, 791278008, -198249695063, -43572627802442, -5264284574193645, -189769141997109804, 100566175129622055037, 26413749605638836403666
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]]*Sin[x]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 26 2020 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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Extended with signs Mar 1997
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STATUS
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approved
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