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 A158996 #6 Mar 19 2014 09:57:58
%S A158996 1,5,300,500,30000,50000,21000000,5000000,300000000,500000000,
%T A158996 330000000000,50000000000,273000000000000,5000000000000,
%U A158996 300000000000000,500000000000000,510000000000000000,50000000000000000
%N A158996 Denominator of Bernoulli(n, -1/10).
%H A158996 Vincenzo Librandi, <a href="/A158996/b158996.txt">Table of n, a(n) for n = 0..250</a>
%t A158996 Table[Denominator[BernoulliB[n, -1/10]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 19 2014 *)
%Y A158996 For numerators see A158995.
%K A158996 nonn,frac
%O A158996 0,2
%A A158996 _N. J. A. Sloane_, Nov 08 2009