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 A290645 #5 Aug 08 2017 11:50:49 %S A290645 1,2,4,2,16,6,64,6,768,10,1024,6,4096,210,245760,6,196608,30,1310720, %T A290645 210,22020096,330,62914560,30,251658240,546,1409286144,14,268435456, %U A290645 30,1073741824,462,992137445376,3570,1803886264320,6,68719476736,51870,375208342978560 %N A290645 a(n) = denominator(Bernoulli(n, x) - Bernoulli(n, 1/2)). %p A290645 a := n -> denom(bernoulli(n, x)-bernoulli(n, 1/2)): seq(a(i), i=0..38); %Y A290645 Cf. A195441, A224783, A287705, A287706. %K A290645 nonn %O A290645 0,2 %A A290645 _Peter Luschny_, Aug 08 2017