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 A158959 #5 Mar 17 2014 08:17:01
%S A158959 1,-17,131,-442,24853,-11050,612491,-300118,25183573,970190,
%T A158959 -4932076745,-1524611374,61514838247663,453106175990,-50137550265523,
%U A158959 -196144583427910,2099358584443935221,109447606273742750,-2062360122343151678743,-76800667149793429726
%N A158959 Numerator of Bernoulli(n, -4/9).
%H A158959 Vincenzo Librandi, <a href="/A158959/b158959.txt">Table of n, a(n) for n = 0..250</a>
%t A158959 Table[Numerator[BernoulliB[n, -4/9]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 17 2014 *)
%Y A158959 For denominators see A158808.
%K A158959 sign,frac
%O A158959 0,2
%A A158959 _N. J. A. Sloane_, Nov 08 2009