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 A335168 #8 Jun 12 2020 12:21:40 %S A335168 1,9,12,10,11,2,14,4,15,13,3,7,8,5,6,1,9,12,10,11,2,14,4,15,13,3,7,8, %T A335168 5,6,1,9,12,10,11,2,14,4,15,13,3,7,8,5,6,1,9,12,10,11,2,14,4,15,13,3, %U A335168 7,8,5,6,1,9,12,10,11,2,14,4,15,13,3,7,8,5,6,1,9 %N A335168 Nim n-th power of 9. %H A335168 J. H. Conway, <a href="https://doi.org/10.1016/0012-365X(90)90008-6">Integral lexicographic codes</a>, Discrete Mathematics 83.2-3 (1990): 219-235. See Table 3. %F A335168 a(n+15) = a(n). - _Rémy Sigrist_, Jun 12 2020 %Y A335168 A row of the array in A335162. %K A335168 nonn %O A335168 0,2 %A A335168 _N. J. A. Sloane_, Jun 12 2020 %E A335168 More terms from _Rémy Sigrist_, Jun 12 2020