A221203 Number of 4 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.

0, 289, 212, 427716, 4984812, 1026177156, 30374196832, 3043294206016, 133567666236732, 10038761087929924, 525060302368983108, 34891927404610766400, 1974298747702764055248, 124298442666315631470276

Offset

1,2

Comments

Row 4 of A221200.

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

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

Crossrefs

Cf. A221200.

Sequence in context: A306651 A272164 A107739 * A188367 A184046 A235810

Adjacent sequences: A221200 A221201 A221202 * A221204 A221205 A221206

Keyword

nonn

Author

R. H. Hardin Jan 04 2013

Status

approved