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A224198
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Number of n X n 0..3 arrays with rows unimodal and antidiagonals nondecreasing.
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1
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4, 160, 16060, 2411246, 451319098, 96914926654, 22835261226043, 5750097317505437, 1521786116504544601, 418628292901694453231, 118789461093773656747975, 34580941641153629118242103
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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
..1..3..3....1..0..0....3..0..0....0..3..1....1..1..1....1..3..1....0..0..1
..3..3..1....1..0..0....1..1..1....3..2..1....3..1..0....3..2..0....3..2..1
..3..2..0....0..3..2....1..1..2....3..2..2....2..3..0....3..3..1....2..3..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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