A221120 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.

1, 21, 4872, 16436223, 723234356389, 429398881440049645

Offset: 1

Author

R. H. Hardin Jan 02 2013

Keywords

• nonn

Comments

Diagonal of A221125

Examples

			Some solutions for n=3
..1..0..1....1..1..3....2..0..0....1..1..0....0..3..0....1..0..3....2..0..1
..0..2..1....0..1..0....1..4..0....1..1..3....1..0..2....0..2..1....0..4..0
..3..0..1....1..1..1....0..0..2....1..1..0....0..1..2....0..2..0....0..0..2