A297218 Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's.

1, 4, 24, 207, 5570, 261939, 20599895, 3819208252, 1400212345305, 937962844219314, 1312275096984570369, 3708386833907642906568, 20177474743877943669370721, 220442917573207336661039688056

Offset: 1

Author

R. H. Hardin, Dec 27 2017

Keywords

• nonn

Comments

Diagonal of A297224.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..23

Crossrefs

Cf. A297224.