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 A202520 #6 Mar 30 2012 17:40:30 %S A202520 3,2835,467775,127702575,350813659321125,147926426347074375, %T A202520 144228265688397515625,84913182070036240111050234375, %U A202520 206217727884373725983979140625,45665884751355139750522260795703125,48463572986198162681964482985158015982421875,176412350932310924219767245054034888177646484375 %N A202520 Denominator of [x^(4n+2)] in the Taylor series log(cosec(x)*sinh(x))= x^2/3 +2*x^6/2835 +2*x^10/467775 +4*x^14/127702575 +... %C A202520 Apparently (almost) a bisection of A046989. %Y A202520 Cf. A012858 (numerators). %K A202520 nonn,frac %O A202520 0,1 %A A202520 _R. J. Mathar_, Dec 20 2011