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A013539
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Numerator of the coefficient [x^(2n+1)] of the Taylor series tan(cosec(x)-coth(x)).
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1
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-1, 13, 877, 2675, 8260913, 410433607, 223758294041, 27276568423051, 127639993821278611, 10512596641186789291, 8302408982767874894797, 3077103479886222660379217
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OFFSET
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0,2
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LINKS
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EXAMPLE
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-x/6 + 13*x^3/324 + 877*x^5/816480 + 2675*x^7/17635968 + ...
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MATHEMATICA
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Numerator[Take[CoefficientList[Series[Tan[Csc[x] - Coth[x]], {x, 0, 26}], x], {2, -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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