A302723 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 22, 89, 1307, 20842, 532511, 17200486, 683140749, 61552556640

Offset: 1

Author

R. H. Hardin, Apr 12 2018

Keywords

• nonn

Comments

Diagonal of A302728.

Examples

			Some solutions for n=5
..0..1..0..0..1. .0..0..1..1..1. .0..1..0..1..1. .0..1..1..1..0
..0..0..1..1..0. .1..1..1..0..1. .1..0..0..0..1. .1..0..0..0..1
..0..0..1..0..1. .1..0..0..0..1. .0..1..1..1..1. .1..1..1..1..1
..1..1..1..0..1. .1..0..1..1..1. .1..1..1..1..0. .1..1..0..1..1
..1..0..0..1..0. .1..1..1..0..0. .0..0..1..0..0. .0..0..1..0..0
		

Crossrefs

Cf. A302728.