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A206691
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Number of nX7 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order
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1
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16, 1216, 11264, 127008, 1454810, 17277556, 208563912, 2543024548, 31198656992, 384076975680, 4737250216482, 58497114248288, 722787914355820, 8933909144447138, 110448738176212632, 1365616810440861728
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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
..0..1..2..3..0..1..2....0..1..2..3..1..0..2....0..1..2..3..0..2..3
..1..3..0..1..2..3..0....1..3..0..1..2..3..0....1..2..3..0..1..3..0
..2..0..1..2..3..0..1....2..0..3..2..0..1..3....2..3..1..2..3..0..1
..0..2..3..0..1..2..3....3..2..1..0..3..2..1....3..1..0..3..2..1..3
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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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