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 A131150 #5 Mar 31 2012 13:21:17 %S A131150 0,1,2,3,4,5,8,6,7,9,10,12,13,11,21,22,19,14,15,20,16,17,18,23,24,25, %T A131150 26,27,31,32,34,35,36,30,33,28,29,58,59,64,62,63,56,60,51,37,38,52,41, %U A131150 39,40,57,61,53,42,43,54,44,45,46,55,47,48,49,50,65,66,69,67,68,70,71 %N A131150 Signature permutation of a Catalan automorphism: row 11 of A122286. %C A131150 Derived from automorphism *A130350 with recursion scheme SPINE. %H A131150 A. Karttunen, <a href="/A131150/b131150.txt">Table of n, a(n) for n = 0..2055</a> %H A131150 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131150 Inverse: A131149. %K A131150 nonn %O A131150 0,3 %A A131150 _Antti Karttunen_, Jun 20 2007