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 A089405 #6 Mar 31 2012 14:02:17 %S A089405 1,1,2,4,9,20,47,112,279,712,1868,5020,13792,38630,110105,318756, %T A089405 935817,2782424,8368484,25434314,78047606 %N A089405 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A073288/A073289. %C A089405 The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes. %H A089405 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089405 nonn %O A089405 0,3 %A A089405 _Antti Karttunen_, Nov 29 2003