%I #9 Jul 19 2023 09:40:47
%S 1,35,5493,6092872,56006562037,4095290003129296,
%T 2365289879500027706428,10827985400073310953152590562,
%U 392915439811314078675718437985175633,112991429416970014192131075985467073204579858
%N Number of n X n 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.
%e Some solutions for n=3
%e ..1..2..2....0..1..1....0..2..1....2..1..2....2..2..0....2..2..1....0..1..0
%e ..1..1..1....0..2..0....1..2..2....2..2..2....2..2..1....2..1..0....1..2..0
%e ..0..1..0....1..2..2....1..1..0....2..2..1....0..0..1....0..1..1....1..2..1
%Y Diagonal of A202889.
%K nonn,more
%O 1,2
%A _R. H. Hardin_, Dec 25 2011