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 A089844 #6 Mar 31 2012 14:02:17 %S A089844 1,1,2,4,9,23,68,205,655,2147,7218,24686,85760,301458,1070820,3836693, %T A089844 13851191,50333389,183965474,675825400,2494114694 %N A089844 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A089865/A089866. %C A089844 The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes. %H A089844 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089844 nonn %O A089844 0,3 %A A089844 _Antti Karttunen_, Dec 20 2003