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 A157871 #5 Mar 16 2014 13:38:25
%S A157871 1,-7,61,-21,91,49,5797,-1981,-23549,88389,15037841,-6154841,
%T A157871 -10416994799,607884329,13199705491,-80834386101,-34108052671693,
%U A157871 13923204233869,51709981061329183,-3015393801263761,-1029159167703793759,801997872697905009,629565265428734688053
%N A157871 Numerator of Bernoulli(n, -1/5).
%H A157871 Vincenzo Librandi, <a href="/A157871/b157871.txt">Table of n, a(n) for n = 0..250</a>
%t A157871 Table[Numerator[BernoulliB[n, -1/5]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 16 2014 *)
%Y A157871 For denominators see A157867.
%K A157871 sign,frac
%O A157871 0,2
%A A157871 _N. J. A. Sloane_, Nov 08 2009