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%I #6 Apr 24 2021 09:22:33
%S 104,5154,388916,41503790,5803025694,1009432228498,210335029800118
%N Number of (n+1) X (n+1) 0..3 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
%C Diagonal of A250676.
%e Some solutions for n=2
%e ..1..1..1....1..2..0....2..2..1....0..2..0....3..0..3....1..0..0....1..0..2
%e ..2..2..2....1..2..3....2..3..3....0..2..1....1..3..0....2..2..2....0..1..3
%e ..2..2..2....1..2..3....2..3..3....1..1..3....3..1..3....2..2..2....2..3..1
%Y Cf. A250676.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 26 2014