A221333 Number of 6Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

1, 19601, 9637322, 7010554450, 4205264399891, 2568131772343102, 1529318909534974055, 908027872393164105009

Offset

1,2

Comments

Row 6 of A221328

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A339534 A319062 A344829 * A069369 A156721 A174760

Adjacent sequences: A221330 A221331 A221332 * A221334 A221335 A221336

Keyword

nonn

Author

R. H. Hardin, Jan 11 2013

Status

approved