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 A157819 #5 Mar 16 2014 13:38:56
%S A157819 1,-3,23,-15,247,5,473,-455,607,12429,-1235,-555775,1479997,35135893,
%T A157819 -57169,-2990414775,118534559,329655706397,-5749662829,
%U A157819 -45692713833455,91546290557,7777794952987941,-1792042786391,-1595024111042171815,1982765468442277
%N A157819 Numerator of Bernoulli(n, -1/4).
%H A157819 Vincenzo Librandi, <a href="/A157819/b157819.txt">Table of n, a(n) for n = 0..250</a>
%t A157819 Table[Numerator[BernoulliB[n, -1/4]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 16 2014 *)
%Y A157819 For denominators see A157818.
%K A157819 sign,frac
%O A157819 0,2
%A A157819 _N. J. A. Sloane_, Nov 08 2009