A283566 Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.

0, 4, 169, 6812, 945100, 226897932, 129997769458, 172466774677716, 522509795096193625, 3748613500011644923440, 62982260120608888164984371

Offset: 1

Author

R. H. Hardin, Mar 11 2017

Keywords

• nonn

Comments

Diagonal of A283572.

Examples

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

Crossrefs

Cf. A283572.