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 A157781 #8 Mar 16 2014 08:40:16 %S A157781 1,-1,11,-3,127,-5,221,-7,367,-9,-1895,-11,1447237,-13,-57253,-15, %T A157781 118526399,-17,-5749677193,-19,91546283957,-21,-1792042789427,-23, %U A157781 1982765468376757,-25,-286994504449237,-27,3187598676787485443,-29,-4625594554880206360895,-31 %N A157781 Numerator of Bernoulli(n, -1/2). %H A157781 Vincenzo Librandi, <a href="/A157781/b157781.txt">Table of n, a(n) for n = 0..250</a> %t A157781 Numerator[BernoulliB[Range[0,35],-(1/2)]] (* _Harvey P. Dale_, Aug 14 2011 *) %Y A157781 For denominators see A157782. %K A157781 sign,frac %O A157781 0,3 %A A157781 _N. J. A. Sloane_, Nov 08 2009