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 A158512 #11 Mar 16 2014 16:37:48 %S A158512 1,-11,157,-99,7319,-165,4171,-23991,1512239,1852983,-312831415, %T A158512 -255444123,304328758067,49452923091,-1056622730741,-12890472052095, %U A158512 26749041130401343,4351895470184559,-2270808626732553983,-1847319496687281507,3100305824706838403989 %N A158512 Numerator of Bernoulli(n, -2/7). %H A158512 Vincenzo Librandi, <a href="/A158512/b158512.txt">Table of n, a(n) for n = 0..250</a> %t A158512 Numerator/@BernoulliB[Range[0,20],-2/7] (* _Harvey P. Dale_, Jun 23 2011 *) %Y A158512 For denominators see A158475. %K A158512 sign,frac %O A158512 0,2 %A A158512 _N. J. A. Sloane_, Nov 08 2009