A221261 Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

0, 4096, 5822, 1250753956, 278802326676, 1080371161000000, 720107530988047980, 1273696206975009956961, 1220346471047321694829098

Offset: 1

Author

R. H. Hardin Jan 06 2013

Keywords

• nonn

Comments

Row 7 of A221255

Examples

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