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 A130956 #5 Mar 31 2012 13:21:16 %S A130956 0,1,3,2,6,8,7,4,5,15,14,19,21,22,16,20,18,12,10,17,9,13,11,39,41,40, %T A130956 37,38,52,51,56,58,59,60,62,63,64,43,42,53,57,61,47,55,48,30,34,50,31, %U A130956 27,25,44,54,49,32,23,46,24,33,36,45,26,35,28,29,113,112,117,119,120 %N A130956 Signature permutation of a Catalan automorphism: row 19 of A130403. %H A130956 A. Karttunen, <a href="/A130956/b130956.txt">Table of n, a(n) for n = 0..2055</a> %H A130956 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130956 Inverse: A130955. %K A130956 nonn %O A130956 0,3 %A A130956 _Antti Karttunen_, Jun 11 2007