A183579 Half the number of nX4 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

8, 407, 9667, 240358, 5987795, 149355515, 3724940988, 92915045150, 2317648165893, 57811518197886, 1442053664104187, 35970710709296927, 897256757776720016, 22381259751777880373, 558280348730102033060

Offset: 1

Author

R. H. Hardin Jan 05 2011

Keywords

• nonn

Comments

Column 4 of A183584

Examples

			Some solutions with a(1,1)<=1 for 3X4
..0..0..2..1....1..1..1..1....1..1..1..1....1..3..1..1....0..0..1..1
..1..0..2..1....1..3..1..1....0..0..2..2....1..3..3..1....1..1..1..1
..1..0..2..2....1..3..3..1....0..0..0..2....2..2..3..3....1..0..0..1
		

Links

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