This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A013526 #13 Nov 12 2016 09:00:50
%S A013526 1,1,3,59,871,325249,35797,24362249,342232522657,8224154352439,
%T A013526 23157229065769,9926476934520521,37638416003805990839,
%U A013526 296699416391356495667713,691054566545631371393
%N A013526 Numerator of [x^(2n)] of the Taylor expansion cosh(cosec(x)-cot(x))=1 +x^2/8 +3*x^4/128 +59*x^6/15360 +871*x^8/1474560 +....
%C A013526 The coefficients of the e.g.f. of x/2, cosh(cosec(x)-cot(x)) = 1 + 1*x^2/(2^2*2!) + 9*x^4/(2^4*4!) + 177*x^6/(2^6*6!) + 6097*x^8/(2^8*8!) + ..., are apparently the absolute values of A003711.
%H A013526 Vincenzo Librandi, <a href="/A013526/b013526.txt">Table of n, a(n) for n = 0..100</a>
%t A013526 Numerator[Take[CoefficientList[Series[Cosh[Csc[x] - Cot[x]], {x, 0, 35}], x], {1, -2, 2}]] (* _Vincenzo Librandi_, Nov 12 2016 *)
%K A013526 nonn,frac
%O A013526 0,3
%A A013526 Patrick Demichel (patrick.demichel(AT)hp.com)
%E A013526 Name edited by _R. J. Mathar_, Dec 19 2011