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 A073290 #5 May 01 2014 02:47:44
%S A073290 0,1,2,3,5,4,6,8,7,12,13,11,10,9,15,14,19,21,22,16,20,18,17,31,32,34,
%T A073290 35,36,30,33,29,26,27,28,25,24,23,40,41,39,38,37,52,51,56,58,59,60,62,
%U A073290 63,64,43,42,53,57,61,47,55,49,50,44,54,48,46,45,87,88,90,91,92,96,97
%N A073290 Permutation A069767 applied twice ("squared").
%H A073290 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F A073290 a(n) = A069767(A069767(n)).
%Y A073290 Inverse permutation: A073291. Occurs for first time in A073200 as row 105. A073267 gives essentially (apart from the first two terms) the counts of elements fixed. Cf. A073292-A073299.
%K A073290 nonn
%O A073290 0,3
%A A073290 _Antti Karttunen_, Jun 25 2002