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 A130398 #9 Apr 16 2014 00:40:47 %S A130398 0,1,3,2,7,8,6,5,4,18,17,20,22,21,16,19,15,12,13,14,11,9,10,50,49,48, %T A130398 46,45,55,54,61,64,63,57,62,59,58,47,44,53,60,56,43,52,40,31,32,41,34, %U A130398 35,36,42,51,39,30,33,37,28,23,24,38,29,25,26,27,148,147,146,143,142 %N A130398 Signature permutation of a Catalan automorphism: row 21 of A130401. %C A130398 The signature-permutation of the Catalan automorphism which is derived from the 21st nonrecursive Catalan automorphism *A089863 with recursion schema REDRONI (see A130401 for the definition). %H A130398 A. Karttunen, <a href="/A130398/b130398.txt">Table of n, a(n) for n = 0..2055</a> %H A130398 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130398 Inverse: A130397. %K A130398 nonn %O A130398 0,3 %A A130398 _Antti Karttunen_, Jun 11 2007