A221884 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction.

6, 326, 11878, 449069, 16834526, 632170065, 23731120064, 890904857988, 33445557232807, 1255586659165355, 47136215887025325, 1769549765701234779, 66431007429900317322, 2493899211740460190981, 93623949326949457663958

Offset: 1

Author

R. H. Hardin Jan 30 2013

Keywords

• nonn

Comments

Column 3 of A221886

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..66