A185831 Half the number of nX5 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

3, 61, 393, 2398, 15782, 98975, 649826, 4143707, 26679121, 171597547, 1102725806, 7092378045, 45590856963, 293158517847, 1884832244162, 12118696565347, 77918494954731, 500981651046567, 3221109348385647, 20710370917938021

Offset: 1

Author

R. H. Hardin Feb 05 2011

Keywords

• nonn

Comments

Column 5 of A185835

Examples

			Some solutions for 4X5 with a(1,1)=0
..0..0..1..0..0....0..1..1..0..1....0..0..1..1..1....0..1..1..0..0
..1..0..1..0..0....0..0..1..0..1....0..1..1..0..1....0..0..1..0..1
..1..0..1..1..1....1..1..0..0..1....1..0..0..0..1....1..0..0..0..1
..1..0..0..0..1....0..0..0..1..1....1..1..1..1..1....1..1..1..1..1
		

Links

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