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 A259556 #15 Jul 31 2015 04:28:03 %S A259556 3,6,5,8,8,6,11,10,9,8,14,13,11,11,10,16,16,14,13,13,11,19,18,17,16, %T A259556 15,14,13,21,21,19,19,18,16,16,14,24,23,22,21,21,19,18,17,16,27,26,24, %U A259556 24,23,22,21,19,19,18,29,29,27,26,26,24,24,22,21,21,19,32,31,30,29,28,27,26,25,24,23,22,21 %N A259556 Rectangular array, read by antidiagonals: T(h,k) = u(h) + v(k), where u = A000201 (lower Wythoff numbers), v = A001950 (upper Wythoff numbers), and h >= 1, k >= 1. %H A259556 Clark Kimberling, <a href="/A259556/b259556.txt">Antidiagonals n=1..60, flattened</a> %e A259556 Northwest corner: %e A259556 3 6 8 11 14 16 19 %e A259556 5 8 10 13 16 18 21 %e A259556 6 9 11 14 17 19 22 %e A259556 8 11 13 16 19 22 24 %e A259556 10 13 15 18 21 23 26 %e A259556 11 14 16 19 22 24 27 %e A259556 T(2,3) = u(2) + v(3) = 3 + 7 = 10. %t A259556 r = GoldenRatio; z = 12; %t A259556 u[n_] := u[n] = Floor[n*r]; v[n_] := v[n] = Floor[n*r^2]; %t A259556 s[m_, n_] := s[m, n] = u[m] + v[n]; t = Table[s[m, n], {m, 1, z}, {n, 1, z}] %t A259556 TableForm[t] (* A259556 array *) %t A259556 Table[s[n - k + 1, k], {n, z}, {k, n, 1, -1}] // Flatten (* A259556 sequence *) %Y A259556 Cf. A259598, A259600, A259601. %K A259556 nonn,tabl,easy %O A259556 1,1 %A A259556 _Clark Kimberling_, Jul 22 2015