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A195961
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Number of nX7 0..4 arrays with each element equal to the number its horizontal and vertical neighbors unequal to itself
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1
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1, 21, 82, 105, 92, 410, 945, 1919, 4478, 10274, 27467, 73240, 184074, 475431, 1290711, 3500703, 9203789, 24842074, 67959738, 185261546, 500164424, 1364785665, 3747581211, 10238569012, 27972042011, 76776169280, 210809165289
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
..2..1..1..1..1..1..1....1..2..2..3..2..2..1....1..3..2..2..3..2..1
..1..1..4..3..3..4..3....1..3..3..4..3..3..1....1..4..3..3..4..2..1
..1..1..1..1..1..1..1....1..1..1..1..1..1..1....1..2..2..2..2..2..1
..3..4..1..1..1..1..1....3..1..1..1..1..1..3....1..2..4..3..3..4..1
..1..1..1..2..2..3..2....1..1..3..2..2..1..1....1..2..3..2..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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