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A009773
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Expansion of tanh(log(1+tan(x))).
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0
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0, 1, -1, 2, -2, -14, 194, -1828, 15688, -130664, 1037864, -7421008, 36772528, 153779536, -9259356016, 209102239712, -3831278863232, 63200892286336, -954398377549696, 12766540334296832, -131022499047886592
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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=20}, CoefficientList[Series[Tanh[Log[1+Tan[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Oct 26 2014 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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