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 A072798 #6 Oct 15 2015 10:55:22 %S A072798 0,1,3,2,4,8,9,7,5,6,12,11,10,13,22,23,26,25,27,21,24,19,14,15,20,17, %T A072798 16,18,35,36,34,31,32,33,30,28,29,40,39,38,37,41,64,65,68,67,69,77,78, %U A072798 76,73,74,82,81,80,83,63,66,75,72,79,61,70,56,42,43,57,45,44,46,62,71 %N A072798 Self-inverse permutation of nonnegative integers obtained by contracting the permutation A069787 induced by the telescoping Catalan bijection DeepRev1CarSide. %H A072798 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (with the complete Scheme source) %H A072798 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A072798 a(n) = A072799(n+1)-1. %K A072798 nonn %O A072798 0,3 %A A072798 _Antti Karttunen_, Jun 12 2002