A186167 1/4 the number of nX8 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

97, 677283, 1610684397, 4840082975532, 13435825601048421, 38514280297010210802

Offset: 1

Author

R. H. Hardin Feb 13 2011

Keywords

• nonn

Comments

Column 8 of A186168

Examples

			Some solutions for 3X8 with a(1,1)=0
..0..0..0..0..2..1..1..0....0..0..0..0..3..0..3..3....0..0..0..0..0..3..3..0
..0..1..1..2..2..3..1..0....0..1..1..0..3..0..0..3....0..1..1..2..2..1..0..0
..0..0..0..0..0..3..3..0....0..0..0..0..3..3..0..0....0..0..0..0..2..1..3..3