A298918 Number of n X n 0..1 arrays with every element equal to 1, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 4, 1, 3, 9, 19, 31, 199, 330, 1377, 6627, 23223, 113179, 849856, 5207476, 43357615

Offset: 1

Author

R. H. Hardin, Jan 29 2018

Keywords

• nonn

Comments

Diagonal of A298924.

Examples

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

Crossrefs

Cf. A298924.