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 A158808 #6 Mar 19 2014 09:57:40
%S A158808 1,18,162,729,65610,59049,7440174,4782969,430467210,387420489,
%T A158808 76709256822,31381059609,257010878197710,2541865828329,45753584909922,
%U A158808 205891132094649,315013432104812970,16677181699666569
%N A158808 Denominator of Bernoulli(n, 1/9).
%H A158808 Vincenzo Librandi, <a href="/A158808/b158808.txt">Table of n, a(n) for n = 0..250</a>
%t A158808 Table[Denominator[BernoulliB[n, 1/9]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 19 2014 *)
%Y A158808 For numerators see A158807.
%K A158808 nonn,frac
%O A158808 0,2
%A A158808 _N. J. A. Sloane_, Nov 08 2009