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A202681
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Number of n X 3 0..3 arrays with row sums equal and column sums equal.
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1
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4, 16, 340, 832, 6784, 224764, 496276, 4373632, 231072928, 353406676, 3224421556, 280342927660, 274352334052, 2553096089392, 372538530340720, 224184063052672, 2113024132266112, 524189682100412404, 189520876535392852
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..2..3....0..1..1....2..3..0....2..1..2....3..2..0....2..0..2....2..2..2
..3..0..2....2..0..0....0..2..3....1..1..3....0..2..3....2..2..0....1..3..2
..2..3..0....0..1..1....3..0..2....2..3..0....2..1..2....0..2..2....3..1..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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