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 A073197 #7 Oct 15 2015 10:57:13 %S A073197 0,1,2,3,4,7,5,6,8,9,10,17,16,20,11,18,12,14,19,13,21,15,22,23,24,25, %T A073197 26,27,45,46,44,42,57,54,43,53,61,28,29,48,47,55,30,49,31,37,38,35,51, %U A073197 40,63,33,50,32,58,60,34,56,39,41,36,62,52,59,64,65,66,67,68,69,70,71 %N A073197 Permutation of natural numbers induced by the Catalan bijection gmA073197 acting on the parenthesizations as ordered by A014486. %C A073197 Is there an equivalent Catalan bijection in A073200? %H A073197 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A073197 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A073197 (Scheme function implementing this automorphism on list-structures:) %o A073197 (define (gmA073197 s) (cond ((pair? s) (gmA073197 (car s)) (gmA072796! s) (gmA073197 (car s)) (gmA072797! s))) s) %Y A073197 Inverse permutation: A073196. The car/cdr-flipped conjugate of A073208, i.e. A073197(n) = A057163(A073208(A057163(n))). Cf. also A073194-A073199. %Y A073197 The scheme functions gma072796! and gma072797! referred to below are given in A072796 and A072797. %K A073197 nonn %O A073197 0,3 %A A073197 _Antti Karttunen_, Jun 25 2002