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 A130924 #5 Mar 31 2012 13:21:16 %S A130924 0,1,3,2,7,6,8,4,5,17,18,15,14,16,20,19,21,9,10,22,11,12,13,48,46,50, %T A130924 49,45,40,39,41,37,38,43,42,44,47,54,55,52,51,53,57,56,58,23,24,59,25, %U A130924 26,27,61,60,62,28,29,63,30,31,32,64,33,34,35,36,141,145,134,133,139 %N A130924 Signature permutation of a Catalan automorphism: Inverse KROF-transform of automorphism *A120706. %C A130924 This is the unique Catalan automorphism f, such that *A120706 = (KROF f). See A122202 for the definition of KROF. %H A130924 A. Karttunen, <a href="/A130924/b130924.txt">Table of n, a(n) for n = 0..2055</a> %H A130924 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %o A130924 (Destructive Scheme implementation of this automorphism, which acts on S-expressions, i.e. list-structures:) %o A130924 (define (*A130924! s) (cond ((pair? s) (*A120705! (cdr s)) (*A120705! (car s)) (*A120706! s))) s) %Y A130924 Inverse: A130923. Cf. A130925 & A130926. %K A130924 nonn %O A130924 0,3 %A A130924 _Antti Karttunen_, Jun 11 2007