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A013541
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Numerator of the coefficient [x^(2n)] of the Taylor series cos(cosec(x) - coth(x)).
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2
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1, -1, 217, -214279, 824071, -337533513773, 8320611986431, -2303253020856673, 7111553692366818727, -4825610634542923917792887, 6031202702741413913839327, -1707209475196496091030335944673
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OFFSET
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0,3
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COMMENTS
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Most (but not all) denominators are in the bisection of A202382.
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LINKS
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EXAMPLE
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1 - x^2/72 + 217*x^4/31104 - 214279*x^6/235146240 + 824071*x^8/9674588160 - ...
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MATHEMATICA
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Numerator[Take[CoefficientList[Series[Cos[Csc[x] - Coth[x]], {x, 0, 26}], x], {1, -1, 2}]] (* G. C. Greubel, Nov 13 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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