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 A129610 #6 Mar 31 2012 13:21:14 %S A129610 0,1,3,2,7,8,5,4,6,17,18,20,21,22,11,12,13,9,10,15,14,16,19,45,46,48, %T A129610 49,50,54,55,57,58,59,61,62,63,64,28,29,30,31,32,33,34,35,23,24,36,25, %U A129610 26,27,39,40,41,37,38,43,42,44,47,52,51,53,56,60,129,130,132,133,134 %N A129610 Signature-permutation of a Catalan automorphism, row 65352 of A089840. %C A129610 Automorphism *A074680 = SPINE(*A129610). See the definition given in A122203. %H A129610 A. Karttunen, <a href="/A129610/b129610.txt">Table of n, a(n) for n = 0..2055</a> %H A129610 A. Karttunen, <a href="/A089840/a089840p.txt">Prolog-program which illustrates the construction of this and similar nonrecursive Catalan automorphisms.</a> %H A129610 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %o A129610 (Constructive and destructive Scheme implementation of this automorphism. These act on S-expressions, i.e. list-structures:) %o A129610 (define (*A129610 s) (cond ((pair? s) (let ((t (*A074680 s))) (cons (car t) (*A074679 (cdr t))))) (else s))) %o A129610 (define (*A129610! s) (cond ((pair? s) (*A074680! s) (*A074679! (cdr s)))) s) %Y A129610 Inverse: A129609. %K A129610 nonn %O A129610 0,3 %A A129610 _Antti Karttunen_, May 22 2007