A250684 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.

104, 2920, 74631, 1670016, 31728758, 523260542, 7662909389

Offset: 1

Author

R. H. Hardin, Nov 26 2014

Keywords

• nonn

Comments

Diagonal of A250691

Examples

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