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 A131147 #5 Mar 31 2012 13:21:17 %S A131147 0,1,2,3,6,4,5,7,8,14,16,19,11,9,15,10,12,17,18,13,20,21,22,42,39,37, %T A131147 53,44,51,47,56,30,33,60,28,25,23,38,43,52,29,24,40,26,31,45,46,32,48, %U A131147 49,50,41,27,34,54,55,35,57,58,59,36,61,62,63,64,123,154,126,112,114 %N A131147 Signature permutation of a Catalan automorphism: row 6 of A122285. %C A131147 Derived from automorphism *A130347 with recursion scheme ENIPS. %H A131147 A. Karttunen, <a href="/A131147/b131147.txt">Table of n, a(n) for n = 0..2055</a> %H A131147 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131147 Inverse: A131148. %K A131147 nonn %O A131147 0,3 %A A131147 _Antti Karttunen_, Jun 20 2007