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 A085170 #8 Oct 15 2015 10:55:24 %S A085170 0,1,2,3,4,5,6,8,7,9,10,11,13,12,14,15,19,21,20,16,22,18,17,23,24,25, %T A085170 27,26,28,29,33,35,34,30,36,32,31,37,38,39,41,40,51,52,56,58,57,53,59, %U A085170 55,54,42,43,60,62,61,47,64,49,48,44,63,50,46,45,65,66,67,69,68 %N A085170 Permutation of natural numbers induced by the Catalan bijection gma085170 acting on symbolless S-expressions encoded by A014486/A063171. %H A085170 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (With the complete Scheme source) %H A085170 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations induced by Catalan automorphisms</a> %o A085170 (Scheme function implementing this automorphism on list-structures:) %o A085170 (define (gma085170! s) (map gma074683! s)) %Y A085170 Inverse: A085169 (see comments there). a(n) = A086434(A082853(n))+A082852(n). Cf. also A074683, A085159, A085160, A085175. %Y A085170 Number of cycles: A086585. Number of fixed points: A000045. Max. cycle size: A086586. LCM of cycle sizes: A086587. (In range [A014137(n-1)..A014138(n-1)] of this permutation). %K A085170 nonn %O A085170 0,3 %A A085170 _Antti Karttunen_, Jun 23 2003