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 A069776 #7 May 01 2014 02:46:54 %S A069776 0,1,2,3,4,5,7,6,8,9,10,11,12,13,17,18,16,14,15,20,21,19,22,23,24,25, %T A069776 26,27,28,29,30,31,32,33,34,35,36,45,46,48,49,50,44,47,42,37,38,43,39, %U A069776 40,41,54,55,57,58,59,53,56,51,52,61,62,63,60,64,65,66,67,68,69,70,71 %N A069776 Permutation of natural numbers induced by the automorphism gma069776! acting on the parenthesizations encoded by A014486. %H A069776 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (Includes the complete Scheme program for computing this sequence) %H A069776 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A069776 (Scheme functions implementing this automorphism on list-structures:) %o A069776 (define (gma069776! s) (cond ((pair? s) (gma069776! (car s)) (gma072797! s))) s) %Y A069776 Inverse of A069775. a(n) = A057163(A057510(A057163(n))) = A069770(A069774(n)). Cf. also A069787, A072797. %Y A069776 Number of cycles: A003239. Number of fixed points: A034731. Max. cycle size: A028310. LCM of cycle sizes: A003418. (In range [A014137(n-1)..A014138(n-1)] of this permutation, possibly shifted one term left or right). %K A069776 nonn %O A069776 0,3 %A A069776 _Antti Karttunen_, Apr 16 2002