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 A073293 #8 May 26 2017 14:54:51
%S A073293 0,1,3,2,7,8,6,5,4,18,17,20,22,21,16,19,15,13,12,14,11,9,10,50,49,48,
%T A073293 45,46,55,54,61,64,63,57,62,58,59,47,44,53,60,56,43,52,41,36,35,40,34,
%U A073293 31,32,42,51,39,33,30,37,28,23,24,38,29,25,26,27,148,147,146,142,143
%N A073293 Permutation A069768 applied three times ("cubed").
%H A073293 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F A073293 a(n) = A069768(A069768(A069768(n))).
%Y A073293 Inverse permutation: A073292. Cf. A073290-A073299.
%K A073293 nonn
%O A073293 0,3
%A A073293 _Antti Karttunen_, Jun 25 2002