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A013539 Numerator of the coefficient [x^(2n+1)] of the Taylor series tan(cosec(x)-coth(x)). 1

%I

%S -1,13,877,2675,8260913,410433607,223758294041,27276568423051,

%T 127639993821278611,10512596641186789291,8302408982767874894797,

%U 3077103479886222660379217

%N Numerator of the coefficient [x^(2n+1)] of the Taylor series tan(cosec(x)-coth(x)).

%H G. C. Greubel, <a href="/A013539/b013539.txt">Table of n, a(n) for n = 0..200</a>

%e -x/6 + 13*x^3/324 + 877*x^5/816480 + 2675*x^7/17635968 + ...

%t Numerator[Take[CoefficientList[Series[Tan[Csc[x] - Coth[x]], {x,0,26}], x], {2, -1, 2}]] (* _G. C. Greubel_, Nov 13 2016 *)

%K sign,frac

%O 0,2

%A Patrick Demichel (patrick.demichel(AT)hp.com)

%E Name edited by _R. J. Mathar_, Dec 21 2011

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Last modified August 5 07:21 EDT 2020. Contains 336209 sequences. (Running on oeis4.)