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 A279724 #4 Dec 21 2016 13:52:45
%S A279724 1,2,2,3,5,5,4,8,14,14,5,11,23,41,41,6,14,32,68,122,122,7,17,41,95,
%T A279724 203,365,365,8,20,50,122,284,608,1094,1094,9,23,59,149,365,851,1823,
%U A279724 3281,3281,10,26,68,176,446,1094,2552,5468,9842,9842
%N A279724 Transpose of array A257943.
%F A279724 A(n,k) = (1 + 3^(k-1)*(2*n - 1))/2, n,k >= 1.
%e A279724 Array A begins as:
%e A279724 . 1 2 5 14 41 122 365 1094 3281 9842
%e A279724 . 2 5 14 41 122 365 1094 3281 9842 29525
%e A279724 . 3 8 23 68 203 608 1823 5468 16403 49208
%e A279724 . 4 11 32 95 284 851 2552 7655 22964 68891
%e A279724 . 5 14 41 122 365 1094 3281 9842 29525 88574
%e A279724 . 6 17 50 149 446 1337 4010 12029 36086 108257
%e A279724 . 7 20 59 176 527 1580 4739 14216 42647 127940
%e A279724 . 8 23 68 203 608 1823 5468 16403 49208 147623
%e A279724 . 9 26 77 230 689 2066 6197 18590 55769 167306
%e A279724 . 10 29 86 257 770 2309 6926 20777 62330 186989
%t A279724 (* Array: *)
%t A279724 Grid[Table[(1 + 3^(k - 1)*(2*n - 1))/2, {n, 10}, {k, 10}]]
%t A279724 (* Array antidiagonals flattened (gives this sequence): *)
%t A279724 Flatten[Table[(1 + 3^(k - 1)*(2*(n - k) + 1))/2, {n, 10}, {k, n}]]
%Y A279724 Cf. A191450, A254051, A257943.
%K A279724 nonn,tabl
%O A279724 1,2
%A A279724 _L. Edson Jeffery_, Dec 17 2016