A300770 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 3, 36, 1536, 116954, 27354464, 16992197390, 27071152148341, 112124137590207769

Offset: 1

Author

R. H. Hardin, Mar 12 2018

Keywords

• nonn

Comments

Diagonal of A300776.

Examples

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

Crossrefs

Cf. A300776.