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 A130958 #5 Mar 31 2012 13:21:16 %S A130958 0,1,3,2,8,7,6,4,5,21,22,20,17,18,19,16,14,10,9,15,11,12,13,58,59,62, %T A130958 63,64,57,61,54,45,46,55,48,49,50,56,60,53,44,47,51,42,38,26,27,37,25, %U A130958 24,23,52,43,39,29,28,40,30,32,31,41,33,34,36,35,170,171,174,175,176 %N A130958 Signature permutation of a Catalan automorphism: row 21 of A130403. %H A130958 A. Karttunen, <a href="/A130958/b130958.txt">Table of n, a(n) for n = 0..2055</a> %H A130958 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130958 Inverse: A130957. %K A130958 nonn %O A130958 0,3 %A A130958 _Antti Karttunen_, Jun 11 2007