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 A086430 #9 Oct 15 2015 10:55:24 %S A086430 0,1,2,3,4,6,7,5,8,9,11,14,16,19,17,18,12,10,15,20,21,13,22,23,25,28, %T A086430 30,33,37,39,42,44,47,51,53,56,60,45,46,48,49,50,31,32,26,24,29,40,38, %U A086430 43,52,54,55,57,58,59,34,35,27,41,61,62,63,36,64,65,67,70,72,75 %N A086430 Permutation of natural numbers induced by the Catalan bijection gma086430 acting on symbolless S-expressions encoded by A014486/A063171. %C A086430 This Catalan bijection rotates the interpretations (pp)-(rr) of Stanley, using the "descending slope" mapping illustrated in A086431. %H A086430 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (With the complete Scheme source) %H A086430 R. P. Stanley, <a href="http://www-math.mit.edu/~rstan/ec/catalan.pdf">Exercises on Catalan and Related Numbers</a> (including 66 combinatorial interpretations) %H A086430 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations induced by Catalan automorphisms</a> %Y A086430 Inverse: A086429. a(n) = A086428(A086428(n)) = A086431(A086429(A086431(n))) = A057164(A085160(A057164(n))) = A086425(A082316(A086426(n))). Occurs in A073200. %Y A086430 Number of cycles: A054357. Number of fixed points: A046698. (In range [A014137(n-1)..A014138(n-1)] of this permutation, possibly shifted one term left or right). %K A086430 nonn %O A086430 0,3 %A A086430 _Antti Karttunen_, Jun 23 2003