A201211 Number of n X 3 0..3 arrays with every row and column running average nondecreasing rightwards and downwards.

23, 216, 1684, 11932, 79739, 512681, 3216277, 19817136, 120478844, 724707450, 4322688971, 25608764387, 150879112600, 884928308606, 5170909446013, 30121160018287, 174998088275471, 1014425257507861, 5869059549460367

Offset: 1

Author

R. H. Hardin, Nov 28 2011

Keywords

• nonn

Comments

Column 3 of A201216.

Examples

			Some solutions for n=5
..0..0..0....0..0..1....0..0..0....0..1..1....0..0..0....0..0..0....0..0..1
..0..0..0....0..2..2....1..2..2....0..3..2....0..2..3....0..0..1....1..1..3
..0..1..1....0..3..2....1..1..1....1..3..3....1..1..2....0..0..2....2..2..2
..0..2..3....2..3..3....1..3..3....2..3..3....1..1..3....1..2..2....2..3..3
..0..2..2....1..2..3....1..2..2....1..3..3....1..2..2....1..3..2....3..3..3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..51

Crossrefs

Cf. A201216.