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 A130969 #2 Mar 31 2012 13:21:16 %S A130969 1,1,2,4,9,20,51,128,345,944,2658,7600,22150 %N A130969 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutations A130935/A130936. %K A130969 nonn %O A130969 0,3 %A A130969 _Antti Karttunen_, Jun 11 2007