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, 781580038958752812299025, 27943844765222490485325201

Offset: 1

Author

R. H. Hardin, Jan 02 2013

Keywords

• nonn

Examples

			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
		

Links

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

Crossrefs

Row 3 of A221125.