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 A120706 #7 Oct 15 2015 10:55:25 %S A120706 0,1,3,2,6,7,8,5,4,15,14,16,18,17,19,20,22,11,12,21,13,10,9,39,40,41, %T A120706 38,37,43,42,47,50,49,44,45,46,48,52,51,53,55,54,60,61,62,29,28,63,30, %U A120706 32,31,56,57,64,33,34,59,36,25,26,58,35,27,24,23,113,112,114,116,115 %N A120706 Permutation of natural numbers induced by the Catalan bijection gma120706 acting on the binary trees encoded by A014486/A063171. %C A120706 See comments at A120705. %H A120706 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> <I>(With the complete Scheme source)</I> %H A120706 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations induced by Catalan automorphisms</a> %o A120706 (Scheme function implementing this automorphism on list-structures:) %o A120706 (define (gma120706! s) (cond ((pair? s) (gma074679! s) (gma120706! (cdr s)) (cond ((pair? (car s)) (gma120706! (caar s)) (gma120705! (cdar s)))))) s) %Y A120706 Inverse of A120705. Cf. A074679. %Y A120706 Number of cycles: A120707. Number of fixed-points: A019590. Max. cycle size: A120708. LCM of cycle sizes: A120709. %K A120706 nonn %O A120706 0,3 %A A120706 _Antti Karttunen_, Jun 28 2006