A303405 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 28, 168, 4013, 236326, 24386918, 4298730424, 1222253462556

Offset: 1

Author

R. H. Hardin, Apr 23 2018

Keywords

• nonn

Comments

Diagonal of A303410.

Examples

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

Crossrefs

Cf. A303410.