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A221850
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Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction
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1
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6, 302, 10085, 354670, 12277568, 426752551, 14818941152, 514719294830, 17877010521736, 620906972675376, 21565339027443844, 749008098922831183, 26014567709115430632, 903538668696429777028, 31381728865914983789375
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..1..0..1....0..2..0....1..1..0....1..1..2....0..1..2....0..1..1....1..0..1
..0..0..1....1..0..0....1..6..0....2..0..0....0..3..0....1..0..1....0..0..1
..1..2..3....3..2..1....0..0..0....0..1..2....2..0..1....2..1..2....0..4..2
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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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