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 A073284 #6 Oct 15 2015 10:55:23 %S A073284 0,1,2,3,4,6,5,7,8,9,11,14,16,19,10,15,12,17,20,13,18,21,22,23,25,28, %T A073284 30,33,37,39,42,44,47,51,53,56,60,24,29,38,43,52,26,40,31,45,48,32,54, %U A073284 57,61,27,41,34,46,55,35,49,58,62,36,50,59,63,64,65,67,70,72,75,79,81 %N A073284 Permutation of natural numbers induced by the Catalan bijection gma073284! acting on the parenthesizations encoded by A014486. %H A073284 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A073284 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A073284 (Scheme function implementing this automorphism on list-structures:) %o A073284 (define (gmA073284! s) (cond ((pair? s) (gmA073284! (car s)) (gmA072796! s) (gmA073284! (cdr s)))) s) %Y A073284 Inverse permutation: A073285. Occurs for first time in A073200 as row 20. %Y A073284 The scheme function gma072796! referred to below given in A072796. %K A073284 nonn %O A073284 0,3 %A A073284 _Antti Karttunen_, Jun 25 2002