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A013530
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Numerator of [x^(2n+1)] of the Taylor expansion sin(cosec(x) - cosech(x)) = x/3 - x^3/162 + 211*x^5/51030 -157*x^7/688905 + 439801*x^9/9821029680 - ...
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1
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1, -1, 211, -157, 439801, -8013839, 890107609, -1552280998637, 76919615326361, -25930051873454543, 659157886816533334709, -1513017447627551117359, 6612344442139455641066609, -112537977176478238359834596179
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OFFSET
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0,3
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COMMENTS
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Essentially a bisection of A013529.
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LINKS
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MATHEMATICA
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Select[Numerator[CoefficientList[Series[Sin[1/Sin[x] - 1/Sinh[x]], {x, 0, 25}], x]], # != 0 &] (* G. C. Greubel, Nov 11 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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