A302259 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 153, 5922, 429854, 64975832, 18964765818, 10943605799334, 12606633987588626

Offset: 1

Author

R. H. Hardin, Apr 04 2018

Keywords

• nonn

Comments

Diagonal of A302265.

Examples

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

Crossrefs

Cf. A302265.