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 A089430 #5 Mar 31 2012 14:02:17 %S A089430 1,1,2,3,6,12,30,79,232,716,2318,7714,26270,90944,319146,1132185, %T A089430 4053618,14626828,53136324,194174324,713267792 %N A089430 Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A082339/A082340. %C A089430 The number of n-node binary trees fixed by the corresponding automorphism(s). %H A089430 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089430 nonn %O A089430 0,3 %A A089430 _Antti Karttunen_, Nov 29 2003