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 A131172 #5 Mar 31 2012 13:21:17 %S A131172 0,1,3,2,8,7,5,4,6,22,21,17,18,20,12,13,10,9,11,15,14,16,19,64,63,58, %T A131172 59,62,46,45,48,49,50,54,55,57,61,34,32,36,35,31,27,26,24,23,25,29,28, %U A131172 30,33,40,41,38,37,39,43,42,44,47,52,51,53,56,60,196,195,189,190,194 %N A131172 Signature permutation of a Catalan automorphism: row 17 of A122286. %C A131172 Derived from automorphism *A074686 with recursion scheme SPINE. %H A131172 A. Karttunen, <a href="/A131172/b131172.txt">Table of n, a(n) for n = 0..2055</a> %H A131172 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131172 Inverse: A131171. %K A131172 nonn %O A131172 0,3 %A A131172 _Antti Karttunen_, Jun 20 2007