A221261 Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2

0, 4096, 5822, 1250753956, 278802326676, 1080371161000000, 720107530988047980, 1273696206975009956961, 1220346471047321694829098

Offset

1,2

Comments

Row 7 of A221255

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A186490 A223694 A186489 * A069273 A043424 A138174

Adjacent sequences: A221258 A221259 A221260 * A221262 A221263 A221264

Keyword

nonn

Author

R. H. Hardin Jan 06 2013

Status

approved