A300459 Number of n X n 0..1 arrays with every element equal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 2, 28, 1146, 78195, 17675111, 9829599051, 14061129641181, 51771244646074395

Offset: 1

Author

R. H. Hardin, Mar 06 2018

Keywords

• nonn

Comments

Diagonal of A300465.

Examples

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

Crossrefs

Cf. A300465.