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 A238207 #17 Feb 21 2014 22:04:27 %S A238207 0,1,2,3,5,8,4,11,17,26,6,14,35,53,80,7,20,44,107,161,242,9,23,62,134, %T A238207 323,485,728,10,29,71,188,404,971,1457,2186,12,32,89,215,566,1214, %U A238207 2915,4373,6560,13,28,98,269,647,1700,3644,8747,13121,19682,15,41,116 %N A238207 Square array T(n,k), n>=0, k>=0, read by antidiagonals, where T(0,k) is A032766(k) and T(n,k) = 3*T(n-1,k) + 2 for n>0. %C A238207 Permutation of nonnegative integers. %F A238207 T(n,k) = T(0,k)*3^n + T(n,0) where T(0,k) = A032766(k) and T(n,0) = 3^n - 1 = A024023(n). %e A238207 Square array begins: %e A238207 0, 1, 3, 4, 6, 7, 9, 10, ... %e A238207 2, 5, 11, 14, 20, 23, 29, 32, ... %e A238207 8, 17, 35, 44, 62, 71, 89, 98, ... %e A238207 26, 53, 107, 134, 188, 215, 269, 296, ... %e A238207 80, 161, 323, 404, 566, 647, 809, 890, ... %e A238207 242, 485, 971, 1214, 1700, 1943, 2429, 2672, ... %e A238207 728, 1457, 2915, 3644, 5102, 5831, 7289, 8018, ... %e A238207 2186, 4373, 8747, 10934, 15308, 17495, 21869, 24056, ... %e A238207 ... %Y A238207 Cf. A024023, A027107, A032766, A048473, A171498, A198643, A198644, A198645, A198646. %K A238207 nonn,tabl %O A238207 0,3 %A A238207 _Philippe Deléham_, Feb 20 2014