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A237068
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Number of (n+1)X(n+1) 0..3 arrays with the upper median of every 2X2 subblock equal
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1
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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=2
..0..3..1....0..0..1....2..2..3....2..1..2....1..3..2....3..1..2....0..3..2
..3..3..2....3..2..2....3..3..0....1..1..1....0..2..1....1..2..1....0..3..3
..3..2..3....1..2..0....2..3..2....3..1..1....3..2..2....2..3..2....3..0..3
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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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