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A013551
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Numerator of [x^n] in the Taylor expansion exp(cot(x)-coth(x))= 1-2*x/3 +2x^2/9 -4*x^3/81 +2*x^4/243 -136*x^5/25515 +676*x^6/229635 -...
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1
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1, -2, 2, -4, 2, -136, 676, -656, 62, -47672, 2714132, -3091664, 7223932, -16788784, 120994136, -15764283616, 13831453742, -3729134588968, 463898158095404, -119174509180016
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OFFSET
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0,2
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COMMENTS
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The inner function is cot(x)-coth(x) = -2x/3 -4x^5/945 -4x^9/93555 -8x^13/18243225 -...
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LINKS
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MATHEMATICA
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Numerator[CoefficientList[Series[Exp[Cot[x]-Coth[x]], {x, 0, 20}], x] ] (* Harvey P. Dale, Feb 16 2014 *)
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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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