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 A082345 #6 Oct 15 2015 10:55:24 %S A082345 0,1,3,2,7,8,6,4,5,17,18,20,21,22,16,19,14,9,10,15,11,13,12,45,46,48, %T A082345 49,50,54,55,57,58,59,61,62,63,64,44,47,53,56,60,42,51,37,23,24,38,25, %U A082345 27,26,43,52,39,28,29,41,33,35,36,40,30,34,32,31,129,130,132,133,134 %N A082345 Permutation of natural numbers induced by the Catalan bijection gma082345 acting on the parenthesizations encoded by A014486/A063171. %H A082345 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A082345 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations induced by Catalan automorphisms</a> %o A082345 (Scheme functions implementing this automorphism on list-structures:) %o A082345 (define (gma082345! s) (cond ((pair? s) (gma069767! s) (gma082345! (cdr s)))) s) %Y A082345 Inverse of A082346. Occurs in A073200 as row 66. Cf. also A069767, A073288-A073289, A082347-A082348. %K A082345 nonn %O A082345 0,3 %A A082345 _Antti Karttunen_, Apr 17 2003