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A203558
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Number of nX2 0..2 arrays with row sums equal and column sums equal
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1
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3, 9, 9, 33, 53, 183, 395, 1249, 3141, 9459, 25655, 75639, 212943, 623093, 1787609, 5222369, 15134933, 44250051, 128996855, 377748883, 1105350731, 3242546393, 9513228125, 27953744695, 82176836303, 241834027353, 712070156205
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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
..1..1....2..2....2..0....2..2....0..0....1..1....1..1....2..0....0..0....2..2
..1..1....2..2....1..1....2..2....0..0....0..2....0..2....1..1....0..0....2..2
..2..0....2..2....1..1....2..2....0..0....2..0....2..0....2..0....0..0....2..2
..1..1....2..2....1..1....2..2....0..0....2..0....0..2....0..2....0..0....2..2
..0..2....2..2....0..2....2..2....0..0....0..2....2..0....0..2....0..0....2..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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