A221927 Number of nX4 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.

13, 2197, 201378, 20246283, 2007184132, 199492714651, 19816266524892, 1968651817039048, 195572208446932549, 19428830291892380296, 1930127245301117267451, 191745542191155118363255

Offset: 1

Author

R. H. Hardin Feb 01 2013

Keywords

• nonn

Comments

Column 4 of A221929

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..49