A221248 Number of 4 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor.

0, 441, 21660, 4096576, 438377904, 56606878084, 6757282699788, 830820670081600, 100904384322992160

Offset: 1

Author

R. H. Hardin, Jan 06 2013

Keywords

• nonn

Comments

Row 4 of A221245.

Examples

			Some solutions for n=3
..0..1..0....0..3..0....0..0..1....0..0..0....0..3..0....2..1..0....0..1..0
..1..1..1....0..2..1....1..4..0....2..6..0....0..2..1....0..5..0....2..3..1
..0..5..0....1..0..1....1..4..0....1..2..0....1..1..0....0..1..0....1..1..0
..1..1..1....0..3..1....0..0..1....1..0..0....2..2..0....0..1..2....0..3..0
		

Crossrefs

Cf. A221245.