A228476 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally.

1, 2, 14, 172, 4354, 211588, 20185842, 3737615288, 1349721589622, 948593164919044, 1298594593323021084, 3461591189556243601228, 17969903126848842785918376, 181660279488635404176787338286

Offset: 1

Author

R. H. Hardin Aug 22 2013

Keywords

• nonn

Comments

Diagonal of A228482

Examples

			Some solutions for n=4
..1..0..0..1....1..0..0..1....1..0..0..0....1..0..1..0....1..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..1
..0..0..0..1....1..0..0..0....0..0..0..0....1..0..0..1....0..0..0..0
..1..0..0..0....0..0..0..1....0..0..0..1....0..1..0..0....0..1..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..27