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 A074686 #6 Oct 15 2015 10:55:23 %S A074686 0,1,3,2,8,7,4,5,6,22,21,17,18,20,10,9,11,12,13,14,15,16,19,64,63,58, %T A074686 59,62,46,45,48,49,50,54,55,57,61,27,26,23,24,25,29,28,30,31,32,33,34, %U A074686 35,36,38,37,39,40,41,42,43,44,47,51,52,53,56,60,196,195,189,190,194 %N A074686 Permutation of natural numbers induced by the Catalan bijection gmA074686! acting on the parenthesizations encoded by A014486/A063171. %H A074686 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A074686 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A074686 (Scheme function implementing this automorphism on list-structures:) %o A074686 (define (gmA074686! s) (cond ((pair? s) (gmA074686! (cdr s)) (gmrobr! s))) s) %Y A074686 Inverse of A074685. a(n) = A057163(A074690(A057163(n))). Occurs in A073200. %K A074686 nonn %O A074686 0,3 %A A074686 _Antti Karttunen_, Sep 11 2002