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 A126317 #2 Mar 31 2012 13:21:13 %S A126317 1,1,2,3,6,16,36,79,162,316,604,1204,2244 %N A126317 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A125977/A125978. %K A126317 nonn %O A126317 0,3 %A A126317 _Antti Karttunen_, Jan 16 2007