A222449 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order.

1, 0, 2, 101, 1847, 161779, 17977932, 8774928190, 4427986390487, 10016765131595843

Offset: 1

Author

R. H. Hardin, Feb 20 2013

Keywords

• nonn

Comments

Diagonal of A222456.

Examples

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

Crossrefs

Cf. A222456.