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A222893
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Number of nX4 0..7 arrays with no element equal to another at a city block distance of exactly two, and new values 0..7 introduced in row major order
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0
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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..1..2..3....0..1..1..2....0..1..1..2....0..1..2..2....0..1..2..3
..3..4..4..5....3..3..4..4....3..4..5..5....3..1..4..3....4..1..5..6
..2..2..1..1....1..5..5..1....5..2..6..7....4..2..0..3....7..6..4..2
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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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