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 A130950 #5 Mar 31 2012 13:21:16 %S A130950 0,1,2,3,6,5,4,7,8,16,19,15,12,13,14,9,11,20,18,10,17,21,22,44,47,53, %T A130950 56,60,43,52,40,34,32,41,31,35,36,42,51,37,25,24,39,28,29,57,61,33,55, %U A130950 49,50,38,23,30,54,48,26,45,62,59,27,46,58,63,64,128,131,137,140,144 %N A130950 Signature permutation of a Catalan automorphism: row 10 of A130403. %H A130950 A. Karttunen, <a href="/A130950/b130950.txt">Table of n, a(n) for n = 0..2055</a> %H A130950 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130950 Inverse: A130949. %K A130950 nonn %O A130950 0,3 %A A130950 _Antti Karttunen_, Jun 11 2007