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A201984
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Number of nX2 zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing
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1
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4, 77, 1170, 14107, 139471, 1177568, 8721417, 57801225, 347923603, 1924356711, 9871703167, 47329086175, 213435856527, 910247506472, 3688234465315, 14255722610693, 52746861442115, 187406263165391, 641125854338628
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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..2...-3.-2...-3..2...-3..2...-3..3...-3.-2...-3.-1...-3.-3...-2.-2...-3..1
.-2.-2...-3.-1...-2.-1...-3..2...-1.-2...-3..2...-2..1...-3..3...-2..3...-2..1
..0.-1....0..1...-1..2...-2..2...-1..0...-2..1....0.-3...-1..1....0.-2...-2..3
..0..3....1..2....0..3....3.-3...-1..3....1..3....2..3...-1..2....2..1...-1..0
..0..3....3..2....2.-2....3.-1....2..0....2..1....3..0....2..3....3.-1....2..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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