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A221299
Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with no occupancy greater than 2
1
17, 1001, 63285, 4119299, 270434991, 17788952657, 1170461488239, 77011254247993, 5066792859597385, 333350527345443633, 21931251172817255263, 1442854892820284178311, 94924922041346379554607
OFFSET
1,1
COMMENTS
Column 4 of A221303
LINKS
EXAMPLE
Some solutions for n=3
..0..1..2..2....2..1..0..2....0..1..1..0....1..0..0..2....2..1..2..0
..2..0..1..2....0..1..1..0....1..1..2..2....1..1..0..2....0..1..2..1
..1..1..0..0....1..1..2..1....1..1..1..1....1..2..2..0....2..0..0..1
CROSSREFS
Sequence in context: A166188 A274548 A266860 * A258304 A221343 A221376
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2013
STATUS
approved