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A223912
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Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.
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0
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3, 36, 666, 14123, 319156, 7526024, 183720802, 4620831232, 119279565646, 3149193338709, 84781194626719, 2321280055370071, 64493788929080253, 1814933493902398900, 51651065174273533812
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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=3
..0..0..1....2..1..0....1..1..2....0..0..0....0..0..0....1..0..0....0..1..0
..1..1..1....2..1..0....1..1..2....1..0..0....0..1..0....1..1..0....2..1..1
..1..2..1....2..2..2....1..2..2....1..0..0....1..1..0....2..1..0....2..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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