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 A130926 #5 Mar 31 2012 13:21:16 %S A130926 0,1,3,2,7,8,4,6,5,17,18,20,21,22,9,10,14,15,19,11,16,12,13,45,46,48, %T A130926 49,50,54,55,57,58,59,61,62,63,64,23,24,25,26,27,37,38,39,40,41,51,52, %U A130926 56,60,28,29,42,43,44,30,53,36,32,33,47,31,35,34,129,130,132,133,134 %N A130926 Signature permutation of a Catalan automorphism: Inverse KROF-transform of automorphism *A120705. %C A130926 This is the unique Catalan automorphism f, such that *A120705 = (KROF f). See A122202 for the definition of KROF. %H A130926 A. Karttunen, <a href="/A130926/b130926.txt">Table of n, a(n) for n = 0..2055</a> %H A130926 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %o A130926 (Destructive Scheme implementation of this automorphism, which acts on S-expressions, i.e. list-structures:) %o A130926 (define (*A130926! s) (cond ((pair? s) (*A120706! (cdr s)) (*A120706! (car s)) (*A120705! s))) s) %Y A130926 Inverse: A130925. Cf. A130923 & A130924. %K A130926 nonn %O A130926 0,3 %A A130926 _Antti Karttunen_, Jun 11 2007