A221695 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction.

1, 144, 3112, 95076, 2627760, 74531185, 2098932856, 59210733473, 1669668324450, 47086135048676, 1327854674388881, 37446255355092156, 1056006037475086696, 29779973215497145163, 839812326958816104725, 23683188619380401285537

Offset: 1

Author

R. H. Hardin Jan 22 2013

Keywords

• nonn

Comments

Row 3 of A221693

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..69