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 A131170 #5 Mar 31 2012 13:21:17 %S A131170 0,1,2,3,4,5,7,6,8,9,10,11,12,13,17,18,16,14,15,20,19,21,22,23,24,26, %T A131170 25,27,28,29,30,31,32,33,34,35,36,45,46,49,48,50,44,47,42,37,38,43,40, %U A131170 39,41,54,55,53,51,52,57,56,58,59,61,60,62,63,64,65,66,67,68,69,73,74 %N A131170 Signature permutation of a Catalan automorphism: row 8 of A122286. %C A131170 Derived from automorphism *A082340 with recursion scheme SPINE. %H A131170 A. Karttunen, <a href="/A131170/b131170.txt">Table of n, a(n) for n = 0..2055</a> %H A131170 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131170 Inverse: A131169. %K A131170 nonn %O A131170 0,3 %A A131170 _Antti Karttunen_, Jun 20 2007