A297648 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1's.

1, 10, 231, 11024, 2525244, 1906300826, 3863740405975, 26223048303944542, 618905182069042142432, 45235515405863464673598537

Offset: 1

Author

R. H. Hardin, Jan 02 2018

Keywords

• nonn

Comments

Diagonal of A297654.

Examples

			Some solutions for n=4
..1..1..1..0. .0..1..0..1. .1..0..1..0. .0..1..1..0. .1..1..1..1
..1..0..0..0. .1..0..1..1. .0..1..0..1. .1..0..0..0. .1..0..0..0
..0..0..1..0. .0..0..1..0. .1..1..0..0. .0..0..1..0. .0..1..1..0
..0..0..0..1. .1..1..0..1. .0..1..0..0. .0..0..1..1. .1..1..0..1
		

Crossrefs

Cf. A297654.