A221343 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2

17, 1033, 66077, 4413085, 299240982, 20386200143, 1390606420092, 94886635979289, 6474877285339469, 441834716000600936, 30149910032297404248, 2057359679730562832221, 140388996646009895985892

Offset

1,1

Comments

Column 4 of A221345

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

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

Crossrefs

Sequence in context: A266860 A221299 A258304 * A221376 A077645 A046731

Adjacent sequences: A221340 A221341 A221342 * A221344 A221345 A221346

Keyword

nonn

Author

R. H. Hardin Jan 11 2013

Status

approved