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 A131002 #5 Mar 31 2012 13:21:16 %S A131002 0,1,3,2,7,8,4,6,5,18,20,22,17,21,10,11,14,19,16,9,15,12,13,50,49,57, %T A131002 55,61,63,58,48,54,45,64,46,59,62,27,26,30,29,33,38,39,51,56,60,42,44, %U A131002 53,47,23,28,37,52,43,24,40,32,34,25,41,36,31,35,147,142,146,148,143 %N A131002 Signature permutation of a Catalan automorphism: row 20 of A122287. %C A131002 Derived from automorphism *A130362 with recursion scheme FORK. %H A131002 A. Karttunen, <a href="/A131002/b131002.txt">Table of n, a(n) for n = 0..2055</a> %H A131002 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131002 Inverse: A131001. %K A131002 nonn %O A131002 0,3 %A A131002 _Antti Karttunen_, Jun 20 2007