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 A089428 #5 Mar 31 2012 14:02:17 %S A089428 1,1,1,3,12,180,1492920,8893324440,284424639188409720 %N A089428 Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A082355/A082356. %H A089428 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089428 nonn %O A089428 0,4 %A A089428 _Antti Karttunen_, Nov 29 2003