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A221725
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Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor
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0
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1, 2989, 429160, 81980587, 14223656107, 2507976517152, 439747190895603, 77182226468656287, 13541666058334423392, 2376046290419395692015, 416894941050089368969405
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..1....0..0..1....0..0..2....0..1..0....0..0..2....0..1..1....0..0..2
..0..2..3....0..4..1....2..2..0....0..4..1....1..3..3....1..0..3....3..2..1
..2..3..0....0..3..0....2..2..0....0..0..2....0..0..1....0..0..1....0..0..0
..0..0..1....1..2..0....1..0..1....0..2..2....1..1..0....1..3..1....0..4..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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