A228384 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally or vertically.

1, 2, 21, 382, 17578, 1755243, 402968942, 207573951234, 242284444195349, 638096588519781536, 3798652903378388363280, 51076133156779686951912785, 1551660182965034835583479000348, 106488245934766828340647881986248382

Offset: 1

Author

R. H. Hardin Aug 21 2013

Keywords

• nonn

Comments

Diagonal of A228390

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..30