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 A130921 #5 Mar 31 2012 13:21:16 %S A130921 0,1,3,2,8,5,7,4,6,22,13,18,10,15,21,12,17,9,14,20,11,19,16,64,36,50, %T A130921 27,41,59,32,46,24,38,55,29,52,43,63,35,49,26,40,58,31,45,23,37,54,28, %U A130921 51,42,62,34,48,25,39,61,33,60,47,57,30,56,44,53,196,106,148,78,120 %N A130921 Signature permutation of a Catalan automorphism: composition of automorphisms *A074684 and *A057164. %H A130921 A. Karttunen, <a href="/A130921/b130921.txt">Table of n, a(n) for n = 0..2055</a> %H A130921 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130921 Inverse: A130922. a(n) = A074684(A057164(n)). Cf. A086425. %K A130921 nonn %O A130921 0,3 %A A130921 _Antti Karttunen_, Jun 11 2007