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 A131171 #5 Mar 31 2012 13:21:17 %S A131171 0,1,3,2,7,6,8,5,4,17,16,18,14,15,20,19,21,11,12,22,13,10,9,45,44,46, %T A131171 43,42,48,47,49,41,38,50,37,40,39,54,53,55,51,52,57,56,58,29,28,59,30, %U A131171 31,32,61,60,62,33,34,63,35,25,26,64,36,27,24,23,129,128,130,126,127 %N A131171 Signature permutation of a Catalan automorphism: row 12 of A122285. %C A131171 Derived from automorphism *A074685 with recursion scheme ENIPS. %H A131171 A. Karttunen, <a href="/A131171/b131171.txt">Table of n, a(n) for n = 0..2055</a> %H A131171 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131171 Inverse: A131172. %K A131171 nonn %O A131171 0,3 %A A131171 _Antti Karttunen_, Jun 20 2007