A221322 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

1, 17, 2008, 2460824, 26135748494, 2568131772343102, 2242286238164144345340, 17596650117587793920907469032

Offset: 1

Author

R. H. Hardin Jan 11 2013

Keywords

• nonn

Comments

Diagonal of A221328

Examples

			Some solutions for n=3
..1..1..2....2..0..1....0..2..0....1..0..2....0..2..1....1..0..1....2..1..0
..0..0..1....1..2..1....1..2..1....1..1..0....2..0..0....1..2..1....2..1..1
..1..1..2....0..2..0....0..1..2....2..1..1....1..2..1....1..2..0....1..1..0