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 A073285 #6 Oct 15 2015 10:55:23 %S A073285 0,1,2,3,4,6,5,7,8,9,14,10,16,19,11,15,12,17,20,13,18,21,22,23,37,24, %T A073285 42,51,25,38,26,44,47,27,53,56,60,28,39,29,43,52,30,40,31,45,54,32,46, %U A073285 57,61,33,41,34,48,55,35,49,58,62,36,50,59,63,64,65,107,66,121,149,67 %N A073285 Permutation of natural numbers induced by the Catalan bijection gma073285! acting on the parenthesizations encoded by A014486. %H A073285 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A073285 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A073285 (Scheme function implementing this automorphism on list-structures:) %o A073285 (define (gmA073285! s) (cond ((pair? s) (gmA073285! (cdr s)) (gmA072796! s) (gmA073285! (car s)))) s) %Y A073285 Inverse permutation: A073284. %Y A073285 The scheme function gma072796! referred to below given in A072796. %K A073285 nonn %O A073285 0,3 %A A073285 _Antti Karttunen_, Jun 25 2002