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 A130931 #5 Mar 31 2012 13:21:16 %S A130931 0,1,3,2,7,8,4,6,5,17,18,20,21,22,11,10,14,16,19,9,12,15,13,45,46,48, %T A130931 49,50,54,55,57,58,59,61,62,63,64,30,33,26,29,27,39,38,42,44,47,51,53, %U A130931 56,60,28,23,25,34,32,37,40,43,52,24,31,35,41,36,129,130,132,133,134 %N A130931 Signature permutation of a Catalan automorphism: row 19 of A130400. %C A130931 The signature-permutation of the Catalan automorphism which is derived from the 19th non-recursive Catalan automorphism *A073270 with recursion schema INORDER (see A130400 for the definition). %H A130931 A. Karttunen, <a href="/A130931/b130931.txt">Table of n, a(n) for n = 0..2055</a> %H A130931 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130931 Inverse: A130932. %K A130931 nonn %O A130931 0,3 %A A130931 _Antti Karttunen_, Jun 11 2007