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 A089403 #5 Mar 31 2012 14:02:17 %S A089403 1,1,1,3,3,15,60,360,7560,582120,7567560,141965858433999600 %N A089403 Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A071661/A071662. %H A089403 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %Y A089403 Cf. A089871, A089875. %K A089403 nonn %O A089403 0,4 %A A089403 _Antti Karttunen_, Nov 29 2003