A221923 Number of nX3 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns.

6, 350, 13228, 508281, 19513309, 749481703, 28788205897, 1105748138634, 42471447510183, 1631315682219574

Offset: 1

Author

R. H. Hardin Jan 31 2013

Keywords

• nonn

Comments

Column 3 of A221925

Examples

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