A250845 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 min(x(i,j),x(i-1,j)) in the j direction.

100, 2457, 44797, 626416, 7134786, 69543783, 601566177, 4741091128, 34703305546, 239290928999, 1571038806045, 9901650019496, 60291096166330, 356456047451631, 2054525997174241, 11582011158980816, 64029681309724210, 347906811859565887

Offset: 1

Author

R. H. Hardin, Nov 28 2014

Keywords

• nonn

Comments

Diagonal of A250853

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..32