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 A086426 #8 Oct 15 2015 10:55:24 %S A086426 0,1,3,2,7,8,6,5,4,17,20,18,22,21,16,19,15,12,13,14,11,10,9,45,54,48, %T A086426 61,57,46,55,50,63,64,49,62,59,58,44,53,47,60,56,43,52,40,31,34,41,32, %U A086426 36,35,42,51,39,30,33,38,29,26,27,37,28,25,24,23,129,157,138,180,166 %N A086426 Permutation of natural numbers induced by the Catalan bijection gma086426 acting on symbolless S-expressions encoded by A014486/A063171. %H A086426 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (With the complete Scheme source) %H A086426 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations induced by Catalan automorphisms</a> %o A086426 (Scheme function implementing this automorphism on list-structures:) %o A086426 (define (gma086426! s) (gmA074683! (gmA057164! s))) %Y A086426 Inverse: A086425. a(n) = A074683(A057164(n)). Occurs in A073200. Cf. also A086427, A086428, A086429, A086430, A086431. %K A086426 nonn %O A086426 0,3 %A A086426 _Antti Karttunen_, Jun 23 2003