A221931 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.

1, 184, 5748, 201378, 6888458, 236114556, 8089630790, 277061308667, 9488649958342, 324954778576668, 11128548401493743, 381112186997579115, 13051688407062314783, 446972092491243621991, 15307140370408977681367

Offset: 1

Author

R. H. Hardin Feb 01 2013

Keywords

• nonn

Comments

Row 3 of A221929

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..47