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 A131161 #5 Mar 31 2012 13:21:17 %S A131161 0,1,3,2,6,8,7,5,4,19,14,15,22,21,16,20,17,13,11,18,12,10,9,51,56,60, %T A131161 37,38,52,40,41,64,62,39,63,59,58,53,42,43,61,57,44,54,45,35,36,46,33, %U A131161 29,28,47,55,48,34,30,49,31,27,25,50,32,26,24,23,163,150,149,168,172 %N A131161 Signature permutation of a Catalan automorphism: row 16 of A122285. %C A131161 Derived from automorphism *A130361 with recursion scheme ENIPS. %H A131161 A. Karttunen, <a href="/A131161/b131161.txt">Table of n, a(n) for n = 0..2055</a> %H A131161 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131161 Inverse: A131162. %K A131161 nonn %O A131161 0,3 %A A131161 _Antti Karttunen_, Jun 20 2007