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 A158998 #8 Mar 18 2014 03:35:31
%S A158998 1,-1,-13,21,323,-1141,-157531,123361,3107843,-22584681,-7737133583,
%T A158998 6298701101,21361359585233,-2489518886621,-108166545951373,
%U A158998 1324340625653241,1117741969306140211,-912462507809610961,-6777866017304661816769,790465529030548467781
%N A158998 Numerator of Bernoulli(n, 3/10).
%H A158998 Vincenzo Librandi, <a href="/A158998/b158998.txt">Table of n, a(n) for n = 0..250</a>
%t A158998 Table[Numerator[BernoulliB[n, 3/10]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 17 2014 *)
%Y A158998 For denominators see A158994.
%K A158998 sign,frac
%O A158998 0,3
%A A158998 _N. J. A. Sloane_, Nov 08 2009