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A013548
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Numerator of [x^(2n)] of the Taylor series sech(cosec(x)-coth(x))= 1-x^2/72 +221*x^4/31104 +244939*x^6/235146240 +1846213*x^8/13544423424-...
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1
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1, -1, 221, -244939, 1846213, -526960582373, 23968139993843, -5189795464140757, 36594801159269740631, -16691319229288614334663751, 11409300606349966887237659743, -198510162914463324156683262269
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OFFSET
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0,3
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..100
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MATHEMATICA
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Numerator[Take[CoefficientList[Series[Sech[Csc[x] - Coth[x]], {x, 0, 35}], x], {1, -2, 2}]] (* Vincenzo Librandi, Nov 12 2016 *)
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CROSSREFS
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Sequence in context: A011816 A048902 A210135 * A083958 A083959 A078212
Adjacent sequences: A013545 A013546 A013547 * A013549 A013550 A013551
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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 21 2011
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STATUS
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approved
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