A185833 Half the number of nX7 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

8, 421, 5004, 54223, 649826, 7678409, 91052720, 1073661088, 12644950311, 149729950026, 1765937206744, 20858521172073, 246298874943372, 2908556504972388, 34344854423802299, 405576876056939440

Offset: 1

Author

R. H. Hardin Feb 05 2011

Keywords

• nonn

Comments

Column 7 of A185835

Examples

			Some solutions for 4X7 with a(1,1)=0
..0..1..1..1..0..0..0....0..1..1..0..1..0..0....0..1..0..0..0..1..0
..0..0..0..0..1..1..1....0..1..0..0..1..1..0....0..1..1..1..0..1..0
..1..1..1..0..1..0..1....1..0..0..1..0..1..0....1..0..0..0..0..1..0
..0..0..1..0..1..0..1....1..1..1..1..0..1..1....1..0..1..1..1..0..0
		

Links

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