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A013533
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Numerator of [x^(2n+1)] in the Taylor expansion arctan(cosec(x) - cosech(x)).
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1
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1, -1, 67, -319, 172747, -5036627, 12689179, -142848518639, 9522619510673, -15014600586761717, 98523462918652219853, -281638034717631160979, 20971906033995645898061, -1307646596002305911998781633
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OFFSET
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0,3
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LINKS
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EXAMPLE
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x/3 - x^3/81 + 67*x^5/13608 - 319*x^7/612360 + 172747*x^9/1745960832 - ...
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MATHEMATICA
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Numerator[Take[CoefficientList[Series[ArcTan[Csc[x] - Csch[x]], {x, 0, 25}], x], {2, -1, 2}]] (* G. C. Greubel, 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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