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 A131157 #5 Mar 31 2012 13:21:17 %S A131157 0,1,3,2,6,7,8,5,4,16,15,14,18,17,19,20,21,12,11,22,13,10,9,43,47,44, %T A131157 39,40,42,41,38,49,48,37,50,46,45,53,52,51,55,54,56,57,58,31,32,59,30, %U A131157 29,28,60,61,62,34,33,63,35,26,25,64,36,27,24,23,136,123,124,137,140 %N A131157 Signature permutation of a Catalan automorphism: row 14 of A122285. %C A131157 Derived from automorphism *A130357 with recursion scheme ENIPS. %H A131157 A. Karttunen, <a href="/A131157/b131157.txt">Table of n, a(n) for n = 0..2055</a> %H A131157 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131157 Inverse: A131158. %K A131157 nonn %O A131157 0,3 %A A131157 _Antti Karttunen_, Jun 20 2007