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A203538
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Number of nX4 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1
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1
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0, 16, 144, 3364, 30976, 614656, 8479744, 129504400, 1978826256, 29961532836, 454089995044, 6895434839056, 104626058201344, 1587468792674704, 24091008317030656, 365573436678862864, 5547427717263648804
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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=5
..0..0..0..1....2..0..0..1....1..0..0..1....2..1..0..2....2..1..0..1
..1..1..0..1....1..1..0..1....1..0..2..1....0..1..0..1....0..1..0..1
..0..0..2..2....0..1..2..1....1..2..0..0....0..2..1..1....0..0..2..2
..0..0..1..0....0..0..2..0....0..2..1..0....1..0..1..0....1..0..1..0
..1..1..1..0....1..1..1..0....0..1..1..0....1..0..1..0....1..0..1..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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