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 A157867 #9 Jul 06 2017 16:06:42
%S A157867 1,10,150,125,3750,3125,656250,78125,2343750,1953125,644531250,
%T A157867 48828125,133300781250,1220703125,36621093750,30517578125,
%U A157867 15563964843750,762939453125,3044128417968750,19073486328125,6294250488281250
%N A157867 Denominator of Bernoulli(n, 1/5).
%H A157867 Vincenzo Librandi, <a href="/A157867/b157867.txt">Table of n, a(n) for n = 0..250</a>
%t A157867 Table[Denominator[BernoulliB[n, 1/5]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 19 2014 *)
%o A157867 (PARI) a(n)=denominator(subst(bernpol(n, x), x, 1/5)); \\ _Michel Marcus_, Jul 06 2017
%Y A157867 For numerators see A157866.
%K A157867 nonn,frac
%O A157867 0,2
%A A157867 _N. J. A. Sloane_, Nov 08 2009