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A270506
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Number of nXnXn triangular 0..4 arrays with some element plus some adjacent element totalling 4+1 exactly once.
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0
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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=3
....2......2......0......0......3......1......0......0......4......4......2
...2.2....4.4....4.3....1.2....2.4....3.3....3.4....2.0....2.4....1.0....0.2
..3.1.1..2.0.1..3.4.1..4.0.0..4.4.0..4.1.3..1.2.4..3.0.3..3.4.4..3.3.4..4.0.3
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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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