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A221382
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Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two
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0
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0, 1, 4, 25, 189, 1156, 6996, 43681, 268632, 1664100, 10278914, 63568729, 392903168, 2429109796
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OFFSET
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1,3
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COMMENTS
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LINKS
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EXAMPLE
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All solutions for n=3
..0..2..0....0..2..2....0..2..2....0..2..0
..2..2..0....0..2..0....0..2..0....2..2..0
..0..2..0....0..2..0....0..2..2....0..2..2
..2..2..0....2..2..0....0..2..0....0..2..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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