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 A012858 #10 Dec 20 2011 14:52:36 %S A012858 1,2,2,4,87734,310732,2631724,13785346041608,303257395102, %T A012858 616840823966644,6080390575672283210764,207461256206578143748856, %U A012858 79209152838572743713996404 %N A012858 Numerator 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 +.. %Y A012858 Cf. A069853 (inner function), A202520 (denominators). %K A012858 nonn,frac %O A012858 0,2 %A A012858 Patrick Demichel (patrick.demichel(AT)hp.com) %E A012858 Values replaced by numerators. - R. J. Mathar, Dec 20 2011