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A013534
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Numerator of [x^(2n)] in the Taylor expansion cos(cosec(x) - cosech(x)).
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1
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1, -1, 1, -5029, 6697, -375719873, 186044689, -1770350411, 102625697881591, -15912188224095499151, 1419184560088744177499, -323645955378411578735051, 935339682040604214800761, -36813244507954712597112169117, 45816041290074218754101655557981
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OFFSET
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0,4
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COMMENTS
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Essentially a bisection of A013529.
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LINKS
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G. C. Greubel, Table of n, a(n) for n = 0..200
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EXAMPLE
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1 - x^2/18 + x^4/1944 - 5029*x^6/3674160 + 6697*x^8/264539520 - ...
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MATHEMATICA
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Numerator[Take[CoefficientList[Series[Cos[Csc[x] - Csch[x]], {x, 0, 25}], x], {1, -1, 2}]] (* G. C. Greubel, Nov 12 2016 *)
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CROSSREFS
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Cf. A068917.
Sequence in context: A188241 A252162 A248986 * A309034 A237690 A290121
Adjacent sequences: A013531 A013532 A013533 * A013535 A013536 A013537
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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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Name edited by R. J. Mathar, Dec 20 2011
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STATUS
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approved
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