A221271 Number of nX3 arrays of occupancy after each element moves to some king-move neighbor, with every occupancy equal to zero or two.

0, 16, 0, 596, 0, 24366, 0, 1001855, 0, 41171316, 0, 1691327788, 0, 69470653170, 0, 2853337539621, 0, 117191717993760, 0, 4813242705044572, 0, 197686734633818238, 0, 8119268451165592095, 0

Offset: 1

Author

R. H. Hardin Jan 08 2013

Keywords

• nonn

Comments

Column 3 of A221273

Examples

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