A297538 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1's.

1, 2, 35, 275, 12161, 3015179, 1610981344, 1479214192234, 4028895802966726, 43695679891258322395

Offset: 1

Author

R. H. Hardin, Dec 31 2017

Keywords

• nonn

Comments

Diagonal of A297544.

Examples

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

Crossrefs

Cf. A297544.