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 A158820 #5 Mar 17 2014 08:17:14
%S A158820 1,-5,-1,35,-227,-1435,27599,123095,-2428187,-18154423,1002748195,
%T A158820 4095412475,-11278566075977,-1310672758291,9265563303353,
%U A158820 564709713458975,-387913690488413419,-315149059886480239,381102197975912820173,221139612243078051395
%N A158820 Numerator of Bernoulli(n, 2/9).
%H A158820 Vincenzo Librandi, <a href="/A158820/b158820.txt">Table of n, a(n) for n = 0..250</a>
%t A158820 Table[Numerator[BernoulliB[n, 2/9]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 17 2014 *)
%Y A158820 For denominators see A158808.
%K A158820 sign,frac
%O A158820 0,2
%A A158820 _N. J. A. Sloane_, Nov 08 2009