A298049 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.

0, 3, 15, 40, 121, 512, 1708, 7014, 35804, 201703, 1158266, 7391098, 54852360

Offset: 1

Author

R. H. Hardin, Jan 11 2018

Keywords

• nonn

Comments

Diagonal of A298055.

Examples

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

Crossrefs

Cf. A298055.