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 A126297 #2 Mar 31 2012 13:21:13 %S A126297 1,1,1,3,6,390,13860,23892750,80215013340,9851050382488595280, %T A126297 694858921540030774800,344551675909308833470705200, %U A126297 1955049249155875335764556836119978483886656454640 %N A126297 Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A125987/A125988. %Y A126297 Cf. A126293. %K A126297 nonn %O A126297 0,4 %A A126297 _Antti Karttunen_, Jan 02 2007