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 A264871 #14 Dec 15 2015 06:42:24
%S A264871 1,2,1,4,3,1,8,9,5,1,16,27,25,9,1,32,81,125,81,17,1,64,243,625,729,
%T A264871 289,33,1,128,729,3125,6561,4913,1089,65,1,256,2187,15625,59049,83521,
%U A264871 35937,4225,129,1,512,6561,78125,531441,1419857,1185921,274625,16641,257
%N A264871 Array read by antidiagonals: T(n,m) = (1+2^n)^m; n,m>=0.
%F A264871 G.f. for row n: 1/(1-(1+2^n)*x). - _R. J. Mathar_, Dec 15 2015
%e A264871 1, 2, 4, 8, 16, 32,
%e A264871 1, 3, 9, 27, 81, 243,
%e A264871 1, 5, 25, 125, 625, 3125,
%e A264871 1, 9, 81, 729, 6561, 59049,
%e A264871 1, 17, 289, 4913, 83521, 1419857,
%e A264871 1, 33, 1089, 35937, 1185921,39135393,
%t A264871 Reverse /@ Table[(1 + 2^(n - m))^m, {n, 0, 9}, {m, 0, n}] // Flatten (* _Michael De Vlieger_, Nov 27 2015 *)
%Y A264871 Cf. A000079 (row 0), A000244 (row 1), A000351 (row 2), A001019 (row 3), A001026 (row 4), A009977 (row 5), A000051 (column 1), A028400 (column 2), A136516 (main diagonal), A165327 (upper subdiagonal).
%K A264871 nonn,tabl,easy
%O A264871 0,2
%A A264871 _R. J. Mathar_, Nov 27 2015