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A009809
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Expansion of tanh(tan(x))*cos(x).
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0
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1, -3, -3, 49, 2905, 83589, -334059, -351159815, -39776495567, -2339943411315, 181395497796525, 87834301596283969, 15443686178950893193, 532878946672338704661, -705534269899082168140347
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]]*Cos[x] , {x, 0, nn}], x] Range[ 0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jan 15 2023 *)
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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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