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 A073291 #8 May 26 2017 14:54:25
%S A073291 0,1,2,3,5,4,6,8,7,13,12,11,9,10,15,14,19,22,21,16,20,17,18,36,35,34,
%T A073291 31,32,33,30,28,23,24,29,25,26,27,41,40,39,37,38,52,51,60,64,63,56,62,
%U A073291 58,59,43,42,53,61,57,44,54,45,46,47,55,48,49,50,106,105,104,100,101
%N A073291 Permutation A069768 applied twice ("squared").
%H A073291 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F A073291 a(n) = A069768(A069768(n)).
%Y A073291 Inverse permutation: A073290. Occurs for first time in A073200 as row 197. Cf. A073292-A073299.
%K A073291 nonn
%O A073291 0,3
%A A073291 _Antti Karttunen_, Jun 25 2002