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A221127
Number of 3 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.
1
1, 144, 4872, 179300, 6405243, 229006550, 8187649472, 292733110656, 10466092166432, 374194374753326, 13378578012147801, 478324533007616827, 17101545371715018992, 611431849960750401963, 21860533596256955469254
OFFSET
1,2
COMMENTS
Row 3 of A221125.
LINKS
EXAMPLE
Some solutions for n=3
..2..0..0....0..1..2....0..2..2....0..1..2....0..1..0....0..1..0....2..2..0
..1..2..1....0..3..0....0..2..0....1..1..2....2..3..0....2..2..3....1..0..2
..2..0..1....2..1..0....2..0..1....1..1..0....0..1..2....0..1..0....1..1..0
CROSSREFS
Cf. A221125.
Sequence in context: A204390 A343295 A008376 * A262788 A319294 A233645
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 02 2013
STATUS
approved