A221203 Number of 4 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.

0, 289, 212, 427716, 4984812, 1026177156, 30374196832, 3043294206016, 133567666236732, 10038761087929924, 525060302368983108, 34891927404610766400, 1974298747702764055248, 124298442666315631470276

Offset: 1

Author

R. H. Hardin Jan 04 2013

Keywords

• nonn

Comments

Row 4 of A221200.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15

Crossrefs

Cf. A221200.