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A009720
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Expansion of tan(tanh(x)*cos(x)).
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0
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1, -3, -43, 2009, 6313, -9872907, 760322045, 105243758801, -41122814903471, 1873399639193325, 3032918686052577317, -1060046322104258754871, -196239553045718536023047, 335369132729230015620066021
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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[Tan[Tanh[x]*Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Mar 20 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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STATUS
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approved
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