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 A073207 #7 Oct 15 2015 10:57:13 %S A073207 0,1,2,3,4,7,5,6,8,9,11,17,16,20,12,18,10,14,15,13,19,21,22,23,31,28, %T A073207 24,33,45,49,44,42,43,54,53,57,61,30,29,46,47,55,25,48,26,37,40,32,38, %U A073207 39,41,34,50,27,51,52,35,56,58,59,36,60,62,63,64,65,84,87,73,96,79,81 %N A073207 Permutation of natural numbers induced by the Catalan bijection gmA073207 acting on the parenthesizations as ordered by A014486. %C A073207 Is there an equivalent Catalan bijection in A073200? %H A073207 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A073207 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A073207 (Scheme function implementing this automorphism on list-structures:) %o A073207 (define (gmA073207 s) (cond ((pair? s) (gmA072796! s) (gmA073207 (cdr s)) (gmA072797! s) (gmA073207 (cdr s)))) s) %Y A073207 Inverse permutation: A073208. The car/cdr-flipped conjugate of A073196, i.e. A073207(n) = A057163(A073196(A057163(n))). Cf. also A073205-A073210. %Y A073207 The scheme functions gma072796! and gma072797! referred to below are given in A072796 and A072797. %K A073207 nonn %O A073207 0,3 %A A073207 _Antti Karttunen_, Jun 25 2002