A223981 Number of n X n 0..3 arrays with rows unimodal and columns nondecreasing.

4, 100, 5029, 358118, 31831914, 3322756326, 392525216516, 51162688962195, 7224066705841458, 1089938030989276020, 173886286002145386302, 29095306392044768817550, 5072863442986308208335738

Offset: 1

Author

R. H. Hardin Mar 30 2013

Keywords

• nonn

Comments

Diagonal of A223987

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..14