A250537 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 x(i,j)-x(i-1,j) in the j direction.

150, 10704, 644779, 27240292, 824599694, 19031828420, 355022719767, 5607306662836

Offset: 1

Author

R. H. Hardin, Nov 24 2014

Keywords

• nonn

Comments

Diagonal of A250544

Examples

			Some solutions for n=2
..2..1..0....1..1..1....2..2..3....3..1..2....3..1..1....3..1..0....3..3..1
..0..3..2....2..2..3....0..0..1....2..0..1....1..1..1....1..1..2....1..3..1
..0..3..3....0..2..3....1..1..3....0..0..1....0..1..3....0..1..3....0..3..1