A203099 Number of nX6 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

422, 1705124, 3790420430, 7574530822364, 15712898935252156, 32766523337754473494, 68145439667266350435686, 141695919109060311625392330, 294680177794961913094327501892

Offset: 1

Author

R. H. Hardin Dec 29 2011

Keywords

• nonn

Comments

Column 6 of A203101

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210