A221296 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with no occupancy greater than 2

1, 19, 2899, 4119299, 53074198285, 6137910765383119

Offset

1,2

Comments

Diagonal of A221303

Links

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

Example

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

Crossrefs

Sequence in context: A277000 A055415 A196541 * A287938 A225602 A195756

Adjacent sequences: A221293 A221294 A221295 * A221297 A221298 A221299

Keyword

nonn

Author

R. H. Hardin Jan 09 2013

Status

approved