A221258 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2

0, 64, 112, 58081, 1319409, 103489929, 4085800416, 226720727104, 10445351809532, 530909339760900, 25591483232781872, 1268920553028932644, 61970903049203536750, 3051063081822723807844, 149565983362653741790314

Offset

1,2

Comments

Row 4 of A221255

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

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

Crossrefs

Sequence in context: A094682 A118158 A264590 * A357390 A195678 A029777

Adjacent sequences: A221255 A221256 A221257 * A221259 A221260 A221261

Keyword

nonn

Author

R. H. Hardin Jan 06 2013

Status

approved