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 A089845 #5 Mar 31 2012 14:02:17 %S A089845 1,1,1,2,10,70,630,6930,90090,90090,1531530,29099070,29099070, %T A089845 669278610,3346393050,10039179150,291136195350,9025222055850, %U A089845 9025222055850,9025222055850,333933216066450 %N A089845 Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A089865/A089866. %H A089845 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089845 nonn %O A089845 0,4 %A A089845 _Antti Karttunen_, Dec 20 2003