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 A090830 #5 Mar 31 2012 14:02:18 %S A090830 1,1,1,3,12,60,120,840,1680,5040,5040,55440,110880,1441440,1441440, %T A090830 1441440,1441440,24504480,24504480,465585120,931170240 %N A090830 Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A085163/A085164. %H A090830 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A090830 nonn %O A090830 0,4 %A A090830 _Antti Karttunen_, Dec 20 2003