A181213 Number of n X n binary matrices with no three 1's adjacent in a line diagonally or antidiagonally.

2, 16, 400, 28561, 7133488, 5037592576, 11494250657760, 81903288018125025, 1774095560440527819780, 120560883729040740095954944, 25387802734116842287569948104640, 16523941893729018365186706701633818689

Offset: 1

Author

R. H. Hardin Oct 10 2010

Keywords

• nonn

Comments

Diagonal of A181217

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n=1..20