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A206969
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Number of n X 3 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal.
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1
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61, 3721, 180294, 8688551, 417476451, 20061347530, 964232197214, 46342878010975, 2227208361171493, 107037437137291874, 5144073029981454466, 247217125357454922329, 11880914300903502206370, 570980378586885004101078
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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..0..2....0..1..1....2..2..1....1..3..3....0..1..0....2..0..3....2..1..2
..3..2..1....3..3..0....0..0..3....1..1..3....3..2..2....0..2..0....3..0..1
..1..0..3....3..1..1....0..0..2....0..1..0....1..2..1....3..1..1....2..0..0
..3..0..1....3..2..1....2..2..0....0..1..0....1..0..2....2..0..2....1..3..0
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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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