A183363 Number of n X n binary arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors.

1, 3, 18, 138, 3102, 137688, 12617557, 2402945556, 936460285557, 739951660291721

Offset: 1

Author

R. H. Hardin Jan 04 2011

Keywords

• nonn

Comments

Diagonal of A183368

Examples

			Some solutions for 5X5
..1..0..0..1..1....1..1..1..0..0....1..1..1..1..0....1..1..0..0..1
..0..0..1..1..1....1..0..1..0..1....1..0..0..1..0....1..1..1..0..0
..1..0..1..0..1....1..1..1..0..0....1..0..0..1..1....1..0..1..1..1
..0..0..1..1..1....0..0..1..1..1....1..1..1..1..1....1..1..0..1..1
..1..0..1..1..1....1..0..1..1..1....1..1..0..0..0....0..1..1..1..0