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A203026
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Number of nX2 0..3 arrays with row sums equal and column sums unequal to adjacent columns
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1
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12, 28, 120, 356, 1472, 4780, 20228, 68724, 296256, 1034008, 4501388, 15995228, 69888012, 251506724, 1098929960, 3991711796, 17408141792, 63681484600, 276945484748, 1018750420536, 4416760710356, 16320495059248, 70538020856288
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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=5
..3..0....3..0....2..2....3..0....0..1....3..2....3..0....1..2....0..1....1..0
..1..2....3..0....1..3....1..2....1..0....2..3....2..1....2..1....0..1....0..1
..3..0....3..0....1..3....1..2....1..0....3..2....3..0....3..0....1..0....0..1
..0..3....0..3....1..3....3..0....0..1....2..3....2..1....3..0....0..1....1..0
..2..1....2..1....2..2....1..2....0..1....2..3....3..0....0..3....0..1....0..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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