A221277 Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two

0, 0, 0, 100, 0, 0, 0, 46656, 0, 0, 0, 27836176, 0, 0, 0, 17029206016, 0, 0, 0, 10443393677376, 0, 0, 0, 6406089127650304, 0, 0, 0, 3929655953461248256, 0

Offset

1,4

Comments

Row 3 of A221275

Links

Table of n, a(n) for n=1..29.

Example

Some solutions for n=4
..0..2..2..0....0..2..0..0....0..2..2..0....0..2..2..0....2..0..2..0
..0..2..0..0....0..2..2..2....0..2..2..0....0..2..2..2....0..2..2..0
..2..0..2..2....2..0..2..0....2..0..0..2....2..0..0..0....0..2..0..2

Crossrefs

Sequence in context: A010114 A287284 A015068 * A287631 A282142 A283010

Adjacent sequences: A221274 A221275 A221276 * A221278 A221279 A221280

Keyword

nonn

Author

R. H. Hardin Jan 09 2013

Status

approved