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A186622
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Number of (n+2)X3 0..2 arrays with 3X3 subblock sums nondecreasing rightwards and downwards.
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1
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19683, 317115, 5109075, 82312875, 1033357725, 12972796635, 162860787181, 1762332055974, 19070362665396, 206362206802584, 2024796890931192, 19867021743214296, 194932417524520248, 1785642965511020136
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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 4X3
..0..0..1....0..0..2....0..0..1....0..0..2....0..1..1....0..0..0....0..1..1
..1..1..1....2..0..0....0..1..1....2..0..1....0..2..1....2..1..0....1..0..1
..0..0..1....1..0..2....1..1..0....0..1..0....1..1..1....2..2..0....0..1..0
..1..1..2....2..0..2....2..1..2....1..0..2....1..2..2....0..0..1....2..0..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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