A221127 Number of 3 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.

1, 144, 4872, 179300, 6405243, 229006550, 8187649472, 292733110656, 10466092166432, 374194374753326, 13378578012147801, 478324533007616827, 17101545371715018992, 611431849960750401963, 21860533596256955469254

Offset

1,2

Comments

Row 3 of A221125.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

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

Adjacent sequences: A221124 A221125 A221126 * A221128 A221129 A221130

Keyword

nonn

Author

R. H. Hardin Jan 02 2013

Status

approved