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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
0
1, 19, 2899, 4119299, 53074198285, 6137910765383119
OFFSET
1,2
COMMENTS
Diagonal of A221303
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2013
STATUS
approved