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 A089404 #6 Mar 31 2012 14:02:17 %S A089404 1,1,2,4,10,26,74,222,698,2264,7536,25600,88406,309440,1095354, %T A089404 3914340,14102324,51165004,186774368,685495334,2527957006 %N A089404 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A073286/A073287. %C A089404 The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes. %H A089404 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089404 nonn %O A089404 0,3 %A A089404 _Antti Karttunen_, Nov 29 2003