A283035 Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element.

0, 4, 119, 9152, 1604067, 706205768, 797350288363, 2355217281173760, 18388049679475271526, 382245292023510825419744

Offset: 1

Author

R. H. Hardin, Feb 27 2017

Keywords

• nonn

Comments

Diagonal of A283042.

Examples

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

Crossrefs

Cf. A283042.