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 A131146 #5 Mar 31 2012 13:21:17 %S A131146 0,1,2,3,6,5,4,7,8,15,19,16,12,13,14,9,11,17,18,10,20,21,22,52,41,40, %T A131146 56,60,43,53,44,31,32,47,34,35,36,37,51,42,25,24,39,28,29,45,46,33,48, %U A131146 49,50,38,23,30,54,55,26,57,58,59,27,61,62,63,64,153,178,164,119,120 %N A131146 Signature permutation of a Catalan automorphism: row 5 of A122286. %C A131146 Derived from automorphism *A130346 with recursion scheme SPINE. %H A131146 A. Karttunen, <a href="/A131146/b131146.txt">Table of n, a(n) for n = 0..2055</a> %H A131146 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131146 Inverse: A131145. %K A131146 nonn %O A131146 0,3 %A A131146 _Antti Karttunen_, Jun 20 2007