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 A131148 #5 Mar 31 2012 13:21:17 %S A131148 0,1,2,3,5,6,4,7,8,13,15,12,16,19,9,14,10,17,18,11,20,21,22,36,41,35, %T A131148 43,52,34,40,31,44,47,32,53,56,60,25,37,24,42,51,23,38,27,45,46,29,48, %U A131148 49,50,28,39,26,54,55,30,57,58,59,33,61,62,63,64,106,120,105,125,153 %N A131148 Signature permutation of a Catalan automorphism: row 4 of A122286. %C A131148 Derived from automorphism *A130348 with recursion scheme SPINE. %H A131148 A. Karttunen, <a href="/A131148/b131148.txt">Table of n, a(n) for n = 0..2055</a> %H A131148 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131148 Inverse: A131147. %K A131148 nonn %O A131148 0,3 %A A131148 _Antti Karttunen_, Jun 20 2007