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 A130939 #5 Mar 31 2012 13:21:16 %S A130939 0,1,2,3,4,5,8,7,6,9,10,13,12,11,21,20,22,17,18,19,16,14,15,23,24,27, %T A130939 26,25,35,34,36,31,32,33,30,28,29,58,59,55,54,57,64,61,63,45,46,62,48, %U A130939 49,50,56,53,60,44,47,51,42,37,38,52,43,39,40,41,65,66,69,68,67,77,76 %N A130939 Signature permutation of a Catalan automorphism: row 5 of A130402. %H A130939 A. Karttunen, <a href="/A130939/b130939.txt">Table of n, a(n) for n = 0..2055</a> %H A130939 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130939 Inverse: A130940. %K A130939 nonn %O A130939 0,3 %A A130939 _Antti Karttunen_, Jun 11 2007