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 A130957 #5 Mar 31 2012 13:21:16 %S A130957 0,1,3,2,7,8,6,5,4,18,17,20,21,22,16,19,15,12,13,14,11,9,10,50,49,48, %T A130957 45,46,55,54,57,59,58,61,62,64,63,47,44,53,56,60,43,52,40,31,32,41,34, %U A130957 35,36,42,51,39,30,33,37,28,23,24,38,29,25,26,27,148,147,146,142,143 %N A130957 Signature permutation of a Catalan automorphism: row 15 of A130402. %H A130957 A. Karttunen, <a href="/A130957/b130957.txt">Table of n, a(n) for n = 0..2055</a> %H A130957 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130957 Inverse: A130958. %K A130957 nonn %O A130957 0,3 %A A130957 _Antti Karttunen_, Jun 11 2007