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 A131145 #5 Mar 31 2012 13:21:17 %S A131145 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 A131145 56,60,43,44,53,31,32,47,34,35,36,37,51,42,25,24,39,28,30,45,46,33,48, %U A131145 49,50,38,23,29,54,55,26,57,58,59,27,61,62,63,64,153,178,164,119,120 %N A131145 Signature permutation of a Catalan automorphism: row 5 of A122285. %C A131145 Derived from automorphism *A130345 with recursion scheme ENIPS. %H A131145 A. Karttunen, <a href="/A131145/b131145.txt">Table of n, a(n) for n = 0..2055</a> %H A131145 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131145 Inverse: A131146. %K A131145 nonn %O A131145 0,3 %A A131145 _Antti Karttunen_, Jun 20 2007