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 A157906 #5 Mar 16 2014 13:38:17
%S A157906 1,-9,109,-63,1051,-357,27973,-3423,93571,42903,-37758991,-3856083,
%T A157906 27354236881,375324963,-34558569101,-49956225543,89299360103987,
%U A157906 8604861227823,-135379634123142593,-1863607938895803,2694379431784131041,495661415733687483,-1648224141815965152043
%N A157906 Numerator of Bernoulli(n, -2/5).
%H A157906 Vincenzo Librandi, <a href="/A157906/b157906.txt">Table of n, a(n) for n = 0..250</a>
%t A157906 Table[Numerator[BernoulliB[n, -2/5]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 16 2014 *)
%Y A157906 For denominators see A157867.
%K A157906 sign,frac
%O A157906 0,2
%A A157906 _N. J. A. Sloane_, Nov 08 2009