A221406 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two

0, 120, 0, 47156, 0, 18852560, 0, 7505597654, 0, 2984164922226, 0, 1185951960926210, 0, 471249297474390114, 0, 187247029623260170674, 0, 74400007192624944055794, 0, 29561675588644660921885852, 0

Offset

1,2

Comments

Column 5 of A221408

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

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

Crossrefs

Sequence in context: A073836 A242836 A229031 * A267428 A156739 A326798

Adjacent sequences: A221403 A221404 A221405 * A221407 A221408 A221409

Keyword

nonn

Author

R. H. Hardin Jan 15 2013

Status

approved