A201210 Number of nX2 0..3 arrays with every row and column running average nondecreasing rightwards and downwards.

10, 50, 216, 867, 3318, 12314, 44858, 161257, 574237, 2029778, 7132780, 24943546, 86875164, 301535122, 1043529630, 3602228998, 12407419230, 42653320657, 146380696477, 501599529832, 1716499421419, 5866845453921, 20030578702565

Offset: 1

Author

R. H. Hardin Nov 28 2011

Keywords

• nonn

Comments

Column 2 of A201216

Examples

			Some solutions for n=7
..0..0....0..3....0..1....0..0....0..1....0..0....0..0....0..0....0..0....0..1
..0..1....0..3....0..1....1..2....0..1....1..2....0..2....0..2....0..0....0..1
..2..2....1..3....0..1....1..1....0..1....1..2....1..1....0..1....0..2....1..1
..2..2....3..3....0..1....1..3....0..2....1..3....1..2....2..2....3..3....2..3
..2..3....3..3....3..3....2..3....1..3....1..3....1..2....3..3....2..3....3..3
..2..3....2..3....2..2....1..3....2..2....1..3....1..2....2..2....1..3....3..3
..2..3....2..3....2..2....1..3....1..3....1..3....2..3....2..3....2..3....3..3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..180