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A250528 Number of (n+1)X(n+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction 0

%I #4 Nov 24 2014 20:48:01

%S 110,6012,393910,28135982,2039109478,147966207622,10608507190002,

%T 752883908026920,52789559542083230,3668155942062924886,

%U 252635964025577748788

%N Number of (n+1)X(n+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction

%C Diagonal of A250536

%e Some solutions for n=2

%e ..0..1..1....1..1..2....1..1..2....0..0..1....0..1..1....0..0..3....1..0..2

%e ..2..1..2....0..3..1....1..1..3....1..1..1....2..0..1....2..3..3....0..1..2

%e ..1..3..1....3..0..3....2..2..3....1..1..3....0..3..2....3..2..3....1..0..2

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 24 2014

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