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 A235803 #10 Jan 20 2014 15:46:12
%S A235803 1,1,1,1,2,1,1,3,3,1,1,5,5,4,1,1,9,11,7,5,1,1,17,25,19,9,6,1,1,33,59,
%T A235803 49,29,11,7,1,1,65,141,133,81,41,13,8,1,1,129,339,361,245,121,55,15,9,
%U A235803 1,1,257,817,985,729,401,169,71,17,10,1
%N A235803 Rectangular array read by upward antidiagonals: A(n,k) = 1 + sqrt(k)*((1+sqrt(k))^n - (1-sqrt(k))^n)/2, n,k >= 0.
%F A235803 A(0,k) = 1, A(n,k) = 1 + k*(sum_{j=0..floor((n-1)/2)} A034867(n,j)*k^j), n>0.
%e A235803 Array begins:
%e A235803 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ...
%e A235803 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ...
%e A235803 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, ...
%e A235803 1, 5, 11, 19, 29, 41, 55, 71, 89, 109, ...
%e A235803 1, 9, 25, 49, 81, 121, 169, 225, 289, 361, ...
%e A235803 1, 17, 59, 133, 245, 401, 607, 869, 1193, 1585, ...
%e A235803 1, 33, 141, 361, 729, 1281, 2053, 3081, 4401, 6049, ...
%e A235803 1, 65, 339, 985, 2189, 4161, 7135, 11369, 17145, 24769, ...
%e A235803 1, 129, 817, 2689, 6561, 13441, 24529, 41217, 65089, 97921, ...
%e A235803 1, 257, 1971, 7345, 19685, 43521, 84727, 150641, 250185, 393985, ...
%e A235803 As a triangle:
%e A235803 1;
%e A235803 1, 1;
%e A235803 1, 2, 1;
%e A235803 1, 3, 3, 1;
%e A235803 1, 5, 5, 4, 1;
%e A235803 1, 9, 11, 7, 5, 1;
%e A235803 1, 17, 25, 19, 9, 6, 1;
%e A235803 1, 33, 59, 49, 29, 11, 7, 1; ...
%Y A235803 Cf. A094373 (column k=1)
%K A235803 nonn,tabl
%O A235803 0,5
%A A235803 _L. Edson Jeffery_, Jan 15 2014