A301535 Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

1, 3, 9, 79, 658, 10783, 255406, 9891331, 588765472, 55421789236, 8214384910527

Offset: 1

Author

R. H. Hardin, Mar 23 2018

Keywords

• nonn

Comments

Diagonal of A301541.

Examples

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

Crossrefs

Cf. A301541.