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A009840
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Expansion of tanh(x)/cos(sin(x)).
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0
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1, 1, 1, -167, 289, -30799, 7624865, -327166135, 29995758529, -7060555404191, 991934013190081, -177889548504511175, 51940497621294961121, -14246314907147632709615, 4386830634217402797858657
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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[Tanh[x]/Cos[Sin[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jan 13 2024 *)
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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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STATUS
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approved
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