A222017 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns.

13, 1363, 86088, 5925053, 403317044, 27460842224, 1870475750419, 127385479747138, 8675741759311142, 590866503322144180, 40241368935424750183, 2740665723881270704902, 186654894043998446085330

Offset: 1

Author

R. H. Hardin Feb 05 2013

Keywords

• nonn

Comments

Column 4 of A222020

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..131