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 A131009 #5 Mar 31 2012 13:21:17 %S A131009 0,1,3,2,7,6,8,4,5,17,16,18,15,14,20,19,22,10,13,21,9,11,12,45,44,46, %T A131009 42,43,48,47,50,40,37,49,39,41,38,54,53,55,52,51,61,60,63,25,35,62,26, %U A131009 34,33,57,56,64,27,36,58,23,28,32,59,24,29,30,31,129,128,130,127,126 %N A131009 Signature permutation of a Catalan automorphism: row 12 of A122288. %C A131009 Derived from automorphism *A074685 with recursion scheme KROF. %H A131009 A. Karttunen, <a href="/A131009/b131009.txt">Table of n, a(n) for n = 0..2055</a> %H A131009 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131009 Inverse: A131010. %K A131009 nonn %O A131009 0,3 %A A131009 _Antti Karttunen_, Jun 20 2007