A189899 Number of n X n binary arrays without the pattern 0 0 1 1 diagonally, vertically, antidiagonally or horizontally.

2, 16, 512, 35656, 6442436, 2719427244, 2662054379066, 6207537762978575

Offset: 1

Author

R. H. Hardin May 01 2011

Keywords

• nonn

Comments

Diagonal of A189905

Examples

			Some solutions for 4X4
..1..0..1..1....1..1..0..1....1..0..0..1....1..0..0..1....0..0..0..0
..1..0..0..0....1..0..1..0....1..1..1..1....1..1..1..1....0..1..1..0
..1..0..0..0....1..0..0..0....0..0..1..0....1..1..0..0....0..0..1..0
..1..1..1..1....1..0..1..1....1..0..1..1....0..1..0..0....0..0..1..0