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 A089412 #5 Mar 31 2012 14:02:17 %S A089412 1,1,2,5,18,84,2793,211123440,140826255570,213340617315, %T A089412 156232599082560 %N A089412 Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A074683/A074684. %H A089412 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089412 nonn %O A089412 0,3 %A A089412 _Antti Karttunen_, Nov 29 2003