A301663 Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.

0, 3, 30, 564, 21224, 1537496, 225780260, 68862687289, 42474080549252, 53316494203981492

Offset: 1

Author

R. H. Hardin, Mar 25 2018

Keywords

• nonn

Comments

Diagonal of A301669.

Examples

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

Crossrefs

Cf. A301669.