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 A234613 #10 Aug 30 2014 18:57:22
%S A234613 0,1,2,3,6,7,4,5,10,11,8,9,12,13,14,15,30,31,28,29,24,25,26,27,20,21,
%T A234613 22,23,18,19,16,17,34,35,32,33,36,37,38,39,40,41,42,43,46,47,44,45,60,
%U A234613 61,62,63,58,59,56,57,54,55,52,53,48,49,50,51,102,103,100
%N A234613 Self-inverse permutation of nonnegative integers, "gray-blue" code: a(n) = A193231(A003188(n)).
%H A234613 Antti Karttunen, <a href="/A234613/b234613.txt">Table of n, a(n) for n = 0..8191</a>
%H A234613 Joerg Arndt, <a href="http://www.jjj.de/fxt/#fxtbook">Matters Computational (The Fxtbook)</a>, section 1.19 "Invertible transforms on words", pp. 49--55 [Cf. especially the identity 1.19-9d: gB = Bg^{-1} given on page 53].
%H A234613 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F A234613 a(n) = A193231(A003188(n)).
%F A234613 a(n) = A006068(A193231(n)).
%F A234613 a(n) = A193231(A234612(A193231(n))).
%o A234613 (Scheme)
%o A234613 (define (A234613 n) (A193231 (A003188 n)))
%o A234613 (define (A234613v2 n) (A006068 (A193231 n))) ;; Alternative two.
%Y A234613 Cf. A003188, A006068, A193231, A234612, A234024-A234027.
%K A234613 nonn
%O A234613 0,3
%A A234613 _Antti Karttunen_, Dec 28 2013