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 A243491 #8 Jun 08 2014 08:59:46 %S A243491 1,2,4,3,8,6,7,6,5,16,12,14,12,10,19,13,14,12,9,17,13,10,11,32,24,28, %T A243491 24,20,38,26,28,24,18,34,26,20,22,53,37,43,37,29,38,26,28,24,18,21,21, %U A243491 18,15,67,41,43,37,23,34,26,20,15,59,41,29,22,31,64,48,56,48,40 %N A243491 Matula-Goebel signature computed for trees rearranged by Catalan automorphism *A069787: a(n) = A127301(A069787(n)). %C A243491 See the comments at A243492. %H A243491 Antti Karttunen, <a href="/A243491/b243491.txt">Table of n, a(n) for n = 0..6917</a> %H A243491 A. Karttunen, <a href="https://oeis.org/wiki/User:Antti_Karttunen/Speculations/On_the_fixed_points_of_A071661">On the fixed points of A071661</a> (Notes in OEIS Wiki) %F A243491 a(n) = A127301(A069787(n)). %o A243491 (Scheme) (define (A243491 n) (A127301 (A069787 n))) %Y A243491 A243492 gives the differences from A127301. Cf. also A243490, A243493. %K A243491 nonn %O A243491 0,2 %A A243491 _Antti Karttunen_, Jun 07 2014