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 A131156 #5 Mar 31 2012 13:21:17 %S A131156 0,1,3,2,8,7,5,6,4,22,21,17,20,18,12,13,15,16,19,10,14,11,9,64,63,58, %T A131156 62,59,46,45,54,57,61,48,55,49,50,32,34,36,31,35,40,41,43,44,47,52,53, %U A131156 56,60,27,26,38,42,51,29,39,30,33,24,37,28,25,23,196,195,189,194,190 %N A131156 Signature permutation of a Catalan automorphism: row 18 of A122286. %C A131156 Derived from automorphism *A130356 with recursion scheme SPINE. %H A131156 A. Karttunen, <a href="/A131156/b131156.txt">Table of n, a(n) for n = 0..2055</a> %H A131156 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131156 Inverse: A131155. %K A131156 nonn %O A131156 0,3 %A A131156 _Antti Karttunen_, Jun 20 2007