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 A126319 #2 Mar 31 2012 13:21:13 %S A126319 1,1,1,3,3,15,33,9061920,1252445414220,126032376305404800, %T A126319 50110448042127911907268800, %U A126319 13399946812028296616282674883512406948355335893125182077721607466200299913000 %N A126319 Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A125977/A125978. %K A126319 nonn %O A126319 0,4 %A A126319 _Antti Karttunen_, Jan 16 2007