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A250957
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Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element
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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
..1..0..0....3..2..0....2..0..0....2..0..0....3..0..0....3..0..2....0..0..0
..1..2..1....3..2..0....3..1..0....3..3..1....2..3..1....2..0..2....3..2..3
..1..1..1....2..2..1....1..3..1....1..1..2....0..1..1....3..0..3....0..1..1
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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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