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 A165823 #2 Mar 30 2012 18:52:03 %S A165823 1,2,6,24,30,1440,42,120960,30,7257600,66,958003200,2730, %T A165823 5230697472000,6,62768369664000,510,64023737057280000 %N A165823 Large denominators of Bernoulli numbers. Mix A002445, 2*A141421 . %C A165823 b(n)=a(2n+1)/a(2n) =2,4,48,2880,241920,145152,= 2*(1,2,24,1440,=1,2*A141421). Among other denominators, A027642,A141056,A164020. 2*A141421 is second bisection of A091137 which is linked to Bernoulli via A027760. See A160014,von Staudt-Clausen theorem. %K A165823 nonn,uned %O A165823 0,2 %A A165823 _Paul Curtz_, Sep 28 2009