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 A158489 #5 Mar 16 2014 14:25:17
%S A158489 1,-9,97,-36,-481,300,10471,-17004,-3572161,1503900,879402485,
%T A158489 -204957852,-851608333333,39666688620,2959809513079,-10337889346380,
%U A158489 -74944106556170657,3489994294713660,6362557475056509757,-1481439997178305788,-8686827386554851273011
%N A158489 Numerator of Bernoulli(n, -1/7).
%H A158489 Vincenzo Librandi, <a href="/A158489/b158489.txt">Table of n, a(n) for n = 0..250</a>
%t A158489 Table[Numerator[BernoulliB[n, -1/7]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 16 2014 *)
%Y A158489 For denominators see A158475.
%K A158489 sign,frac
%O A158489 0,2
%A A158489 _N. J. A. Sloane_, Nov 08 2009