A200709 Number of n X 3 0..7 arrays with every row and column running average nondecreasing rightwards and downwards.

154, 7370, 317656, 12904303, 501622631, 18836416881, 688892422045, 24679562321720, 870010030574894, 30274045926194001, 1042315568516067529, 35569907932628823872, 1204745819326637993000, 40540325062931324645529

Offset: 1

Author

R. H. Hardin, Nov 20 2011

Keywords

• nonn

Comments

Column 3 of A200713.

Examples

			Some solutions for n=4
..0..4..7....0..0..3....0..0..1....0..0..1....0..0..0....0..2..2....0..2..2
..0..4..7....0..0..5....0..4..3....0..0..4....0..2..1....0..2..7....0..4..7
..0..6..7....0..4..6....0..2..3....0..0..5....0..4..3....0..4..6....0..4..7
..1..6..7....0..3..7....0..5..3....2..2..7....0..5..4....0..4..5....0..6..6
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..23

Crossrefs

Cf. A200713.