A300466 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 8, 160, 8608, 1231578, 462538206, 456303004550, 1184061531948168, 8081950028633306006, 145086737722751262521230, 6849888315993282295524030922

Offset: 1

Author

R. H. Hardin, Mar 06 2018

Keywords

• nonn

Comments

Diagonal of A300472.

Examples

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

Crossrefs

Cf. A300472.