A183549 Number of nX4 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

9, 299, 5287, 95101, 1728533, 31363527, 569461759, 10339213765, 187720469393, 3408294462361, 61881741606489, 1123538699592837, 20399220213631985, 370372813824090515, 6724571832069212589, 122092833670153549855

Offset: 1

Author

R. H. Hardin Jan 05 2011

Keywords

• nonn

Comments

Column 4 of A183554

Examples

			Some solutions for 3X4
..2..0..0..0....1..1..1..1....0..0..0..1....1..1..0..0....2..2..2..0
..2..2..0..1....0..1..1..1....2..2..0..1....1..1..0..2....1..2..2..0
..2..0..0..1....0..1..0..0....2..2..0..0....0..0..2..2....1..1..2..2
		

Links

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