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 A085175 #8 Oct 15 2015 10:55:24 %S A085175 0,1,2,3,4,6,5,7,8,9,14,11,16,19,10,15,12,17,21,13,20,18,22,23,37,28, %T A085175 42,51,25,39,30,44,56,33,53,47,60,24,38,29,43,52,26,40,31,45,58,35,54, %U A085175 49,63,27,41,34,48,62,32,57,46,59,36,61,55,50,64,65,107,79,121,149 %N A085175 Involution of natural numbers induced by the Catalan bijection gma085175 acting on symbolless S-expressions encoded by A014486/A063171. %H A085175 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (With the complete Scheme source) %H A085175 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations induced by Catalan automorphisms</a> %o A085175 (Scheme function implementing this automorphism on list-structures:) %o A085175 (define (gma085175! s) (gma085169! (gma057164! (gma085170! s)))) %Y A085175 a(n) = A085169(A057164(A085170(n))). Cf. also A085161. %K A085175 nonn %O A085175 0,3 %A A085175 _Antti Karttunen_, Jun 23 2003