A302303 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 3, 13, 66, 445, 5715, 76642, 2150420, 124691962, 17216491876

Offset: 1

Author

R. H. Hardin, Apr 05 2018

Keywords

• nonn

Comments

Diagonal of A302309.

Examples

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

Crossrefs

Cf. A302309.