A183578 Half the number of n X 3 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

2, 78, 814, 9667, 110674, 1282814, 14823037, 171459557, 1982720806, 22929915669, 265174801858, 3066662593835, 35464903052433, 410139828611289, 4743130059530921, 54852719114258196, 634353415473617224

Offset: 1

Author

R. H. Hardin, Jan 05 2011

Keywords

• nonn

Comments

Column 3 of A183584.

Examples

			Some solutions with a(1,1)<=1 for 5 X 3
..0..0..0....1..0..0....0..0..2....1..0..0....0..0..3....0..1..1....1..0..1
..0..3..3....1..1..0....0..2..2....1..1..1....0..0..3....0..0..0....1..0..1
..1..0..0....0..0..2....2..1..2....3..0..0....3..3..3....2..2..0....1..0..0
..1..1..1....0..0..2....2..1..1....3..0..0....2..2..3....0..0..0....0..1..0
..0..0..1....0..1..1....1..1..1....3..0..0....2..2..2....0..1..1....0..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200

Crossrefs

Cf. A183584.