A298088 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 15, 30, 45, 171, 229, 417, 822, 1359, 1993, 5049, 3669, 7878, 33158, 16734, 37752, 734240, 160344, 389218, 50665319, 1735920, 6661033

Offset: 1

Author

R. H. Hardin, Jan 12 2018

Keywords

• nonn

Comments

Diagonal of A298093.

Examples

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

Crossrefs

Cf. A298093.