A221302 Number of n X 7 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

239, 388741, 668597561, 1170461488239, 2055191230733819, 3609497709468161601

Offset

1,1

Comments

Column 7 of A221303.

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Cf. A221303.

Sequence in context: A223974 A208681 A221327 * A072173 A282230 A015161

Adjacent sequences: A221299 A221300 A221301 * A221303 A221304 A221305

Keyword

nonn

Author

R. H. Hardin Jan 09 2013

Status

approved