A221258 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

0, 64, 112, 58081, 1319409, 103489929, 4085800416, 226720727104, 10445351809532, 530909339760900, 25591483232781872, 1268920553028932644, 61970903049203536750, 3051063081822723807844, 149565983362653741790314

Offset: 1

Author

R. H. Hardin Jan 06 2013

Keywords

• nonn

Comments

Row 4 of A221255

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..16