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 A130990 #7 Apr 11 2022 18:25:54 %S A130990 0,1,2,3,4,5,8,6,7,9,10,12,13,11,20,21,19,14,15,22,16,17,18,23,24,25, %T A130990 26,27,31,32,36,34,35,30,33,28,29,54,55,59,57,58,53,56,51,37,38,52,41, %U A130990 39,40,61,64,60,42,43,62,44,45,46,63,47,49,50,48,65,66,69,67,68,70,71 %N A130990 Signature permutation of a Catalan automorphism: row 11 of A122287. %C A130990 Derived from automorphism *A130350 with recursion scheme FORK. %H A130990 A. Karttunen, <a href="/A130990/b130990.txt">Table of n, a(n) for n = 0..2055</a> %H A130990 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A130990 Cf. A122287. %Y A130990 Inverse: A130989. %K A130990 nonn %O A130990 0,3 %A A130990 _Antti Karttunen_, Jun 20 2007