A297851 Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero.

0, 3, 15, 30, 45, 131, 181, 298, 430, 1022, 1429, 2164, 2135, 4620, 3680, 9110, 11981, 9540, 87199, 22330, 77938, 182912, 34081

Offset: 1

Author

R. H. Hardin, Jan 07 2018

Keywords

• nonn

Comments

Diagonal of A297858.

Examples

			Some solutions for n=7
..0..0..1..1..1..0..1. .0..0..1..1..0..1..0. .0..1..1..0..0..1..1
..1..1..0..0..0..1..0. .1..1..0..0..1..0..0. .1..0..0..1..1..0..0
..0..1..1..1..1..1..0. .0..0..0..1..0..1..1. .0..1..0..0..0..0..1
..0..1..0..0..0..1..1. .1..1..0..1..0..0..0. .0..1..0..1..1..0..1
..0..1..1..1..1..0..0. .0..1..0..0..1..0..1. .0..1..0..0..0..0..1
..1..1..0..0..0..0..1. .1..0..1..0..1..0..1. .1..0..0..1..1..0..0
..0..0..1..1..1..0..1. .1..0..0..0..1..0..1. .0..1..1..0..0..1..1
		

Crossrefs

Cf. A297858.