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A013545
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Numerator of the coefficient [x^(2n+1)] of the Taylor series arctanh(cosec(x) - coth(x)).
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1
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-1, 13, 29, 397, 74927, 2570951, 495301, 2978520989, 879781928617, 1962442468445621, 4485273725677799419, 17810142018975186977
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OFFSET
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0,2
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LINKS
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EXAMPLE
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-x/6 + 13*x^3/324 + 29*x^5/27216 + 397*x^7/2449440 + 74927*x^9/3491921664 + ... .
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MATHEMATICA
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Numerator[Take[CoefficientList[Series[ArcTanh[Csc[x] - Coth[x]], {x, 0, 35}], x], {2, -2, 2}]] (* Vincenzo Librandi, Nov 12 2016 *)
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CROSSREFS
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KEYWORD
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sign,frac
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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