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A253488
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Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally
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0
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81, 1377, 4196, 10477, 32652, 113573, 415106, 1561268, 5980490, 23190284, 90686546, 356759588, 1409549210, 5586667004
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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=4
..1..1..1..2..1....0..2..2..1..2....1..2..2..2..2....1..2..1..1..1
..2..1..1..2..1....0..1..1..0..1....1..1..1..1..1....1..1..0..0..0
..2..1..1..2..1....1..2..2..1..2....2..2..2..2..2....2..2..1..1..1
..1..0..0..1..0....1..2..2..1..2....2..2..2..2..2....1..1..0..0..0
..2..1..1..2..1....1..2..2..1..2....1..1..1..1..2....1..1..0..1..2
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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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