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A202682
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Number of nX4 0..3 arrays with row sums equal and column sums equal
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1
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4, 96, 832, 89520, 389704, 39506424, 235092820, 84143001856, 158178730792, 58325025609436, 113966068418140, 139531230013836984, 86009870625207052, 126568039998320295184, 67124345535323038912, 293815852611183910971392
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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
..1..3..3..1....2..3..2..1....1..1..3..3....2..2..0..0....0..2..0..2
..2..0..3..3....3..0..3..2....3..3..1..1....0..0..2..2....0..0..3..1
..3..3..0..2....1..3..1..3....2..2..2..2....1..1..1..1....3..1..0..0
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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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