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 A118766 #6 Mar 30 2012 18:50:54 %S A118766 0,1,2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,10,11,22,23,24,25,26,27, %T A118766 28,20,21,29,32,33,34,35,36,37,38,39,30,31,42,43,44,45,46,47,48,40,41, %U A118766 49,52,53,54,55,56,57,58,59,50,51,62,63,64,65,66,67,68,60,61,69,72,73,74 %N A118766 A118764(A118764(n)). %C A118766 Inverse integer permutation of A118765; %C A118766 A118763(a(n)) = a(A118763(n)) = A118764(n). %H A118766 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A118766 Cf. A118765. %K A118766 nonn %O A118766 0,3 %A A118766 _Reinhard Zumkeller_, May 01 2006