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 A120707 #2 Mar 31 2012 14:02:29 %S A120707 1,1,1,2,3,6,10,20,39,72,138,286,512 %N A120707 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A120705/A120706. %C A120707 The number of orbits to which the corresponding automorphisms partition the set of A000108(n) binary trees of n internal nodes. %K A120707 nonn %O A120707 0,4 %A A120707 _Antti Karttunen_, Jun 28 2006