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A204080
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Number of nX4 0..3 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, 256, 11236, 107584, 3904576, 76212900, 1650959424, 39031534096, 864587548224, 19412272036096, 437675604807204, 9849402103175716, 221594251463336196, 4988444738917091904, 112294697209531469824
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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
..1..0..0..0....3..0..0..1....3..0..0..1....2..0..0..1....3..0..0..0
..1..2..1..1....1..1..1..1....1..1..1..1....1..1..2..1....1..1..1..1
..0..0..3..3....0..2..1..0....0..1..1..0....0..2..3..0....0..0..2..3
..1..1..0..0....0..0..0..0....0..1..0..0....0..0..1..0....0..0..1..0
..0..0..1..1....1..1..1..1....0..1..1..1....1..1..1..0....1..1..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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