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 A130940 #5 Mar 31 2012 13:21:16 %S A130940 0,1,2,3,4,5,8,7,6,9,10,13,12,11,21,22,20,17,18,19,15,14,16,23,24,27, %T A130940 26,25,35,36,34,31,32,33,29,28,30,58,59,62,63,64,57,61,54,45,46,55,48, %U A130940 49,50,56,60,52,40,39,51,41,37,38,53,43,47,44,42,65,66,69,68,67,77,78 %N A130940 Signature permutation of a Catalan automorphism: row 5 of A130403. %H A130940 A. Karttunen, <a href="/A130940/b130940.txt">Table of n, a(n) for n = 0..2055</a> %H A130940 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130940 Inverse: A130939. %K A130940 nonn %O A130940 0,3 %A A130940 _Antti Karttunen_, Jun 11 2007