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A024303
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Expansion of tan(tanh(x))*x/2.
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0
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0, 1, 0, -24, 448, -640, -658944, 56992768, -2831024128, -86998155264, 51519425740800, -9075812362878976, 917148920337924096, 26667007293767286784, -33058738844745936666624, 2573727989288825813729280, 4259701574179331481681264640
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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}, Take[CoefficientList[Series[Tan[Tanh[x]]*x/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 22 2017 *)
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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
More terms from and prior Mathematica program replaced by Harvey P. Dale, Aug 22 2017
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STATUS
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approved
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