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 A131143 #7 Aug 19 2022 14:27:04 %S A131143 0,1,2,3,5,6,4,7,8,13,15,12,16,19,9,14,10,17,18,11,20,21,22,36,41,35, %T A131143 43,52,31,40,32,44,47,34,53,56,60,25,37,24,42,51,23,38,26,45,46,27,48, %U A131143 49,50,28,39,29,54,55,30,57,58,59,33,61,62,63,64,106,120,105,125,153 %N A131143 Signature permutation of a Catalan automorphism: row 4 of A122285. %C A131143 Derived from automorphism *A130343 with recursion scheme ENIPS. %H A131143 A. Karttunen, <a href="/A131143/b131143.txt">Table of n, a(n) for n = 0..2055</a> %H A131143 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A131143 Cf. A122285, A130343. Inverse: A131144. %K A131143 nonn %O A131143 0,3 %A A131143 _Antti Karttunen_, Jun 20 2007