A298884 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 15, 40, 123, 516, 1818, 7768, 41048, 242083, 1483959, 10171555

Offset: 1

Author

R. H. Hardin, Jan 28 2018

Keywords

• nonn

Comments

Diagonal of A298888.

Examples

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

Crossrefs

Cf. A298888.