A221331 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2

1, 577, 33873, 2460824, 162430981, 10794156688, 711858713069, 46910596287335, 3089778765626866, 203426990390736036, 13389504827335440162, 881130781309712234876, 57978558022828544235124, 3814742757245230038689495

Offset

1,2

Comments

Row 4 of A221328

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Sequence in context: A157264 A201046 A154511 * A163042 A069365 A163053

Adjacent sequences: A221328 A221329 A221330 * A221332 A221333 A221334

Keyword

nonn

Author

R. H. Hardin Jan 11 2013

Status

approved