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 A089424 #6 Mar 31 2012 14:02:17 %S A089424 1,1,2,3,6,18,48,151,478,1580,5304,18220,63308,222936,792436,2841807, %T A089424 10265130,37322728,136468200,501523066,1851418668 %N A089424 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A082351/A082352. %C A089424 The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes. %H A089424 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089424 nonn %O A089424 0,3 %A A089424 _Antti Karttunen_, Nov 29 2003