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A221695
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Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction
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1
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1, 144, 3112, 95076, 2627760, 74531185, 2098932856, 59210733473, 1669668324450, 47086135048676, 1327854674388881, 37446255355092156, 1056006037475086696, 29779973215497145163, 839812326958816104725, 23683188619380401285537
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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..3..2....0..3..0....1..0..0....0..2..0....1..0..1....2..0..0....1..0..2
..0..1..0....0..1..1....2..1..1....2..2..1....2..1..1....2..1..1....2..1..0
..1..2..0....2..2..0....1..3..0....1..0..1....1..2..0....1..0..2....0..3..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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