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 A073287 #6 Oct 17 2015 08:36:23 %S A073287 0,1,2,3,4,5,6,8,7,9,10,11,12,13,14,15,19,22,21,16,20,17,18,23,24,25, %T A073287 26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,51,52,60,64,63,56,62, %U A073287 58,59,42,43,53,61,57,44,54,45,46,47,55,48,49,50,65,66,67,68,69,70,71 %N A073287 Permutation of natural numbers induced by the composition of the Catalan bijections A069768 & A069770. %H A073287 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A073287 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A073287 a(n) = A069768(A069770(n)). %Y A073287 Inverse permutation: A073286. Occurs for first time in A073200 as row 69. Counts of the fixed elements: A073268. %K A073287 nonn %O A073287 0,3 %A A073287 _Antti Karttunen_, Jun 25 2002