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

1,2

Comments

Column 3 of A221273

Links

Table of n, a(n) for n=1..25.

Example

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

Crossrefs

Sequence in context: A221726 A221729 A219950 * A198804 A274377 A221380

Adjacent sequences: A221268 A221269 A221270 * A221272 A221273 A221274

Keyword

nonn

Author

R. H. Hardin Jan 08 2013

Status

approved