A250748 Number of (n+1)X(n+1) 0..2 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.

32, 237, 1353, 6663, 29814, 124785, 497471, 1911819, 7141428, 26081157, 93524517, 330341391, 1152105314, 3974940633, 13587035451, 46067386899, 155081690112, 518770438893, 1725559820033, 5710472045463, 18811007467662, 61706609086017

Offset: 1

Author

R. H. Hardin, Nov 27 2014

Keywords

• nonn

Comments

Diagonal of A250755

Examples

			Some solutions for n=4
..0..0..0..0..0....2..2..2..2..2....1..1..0..0..0....2..2..2..2..2
..0..0..0..0..0....2..2..2..2..2....0..0..1..1..1....0..0..0..0..0
..1..1..2..2..2....2..2..2..2..2....0..0..1..1..1....0..0..1..1..1
..0..0..2..2..2....1..1..1..1..1....0..0..1..1..1....0..0..2..2..2
..0..0..2..2..2....0..0..2..2..2....1..1..2..2..2....0..0..2..2..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..53