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A202030
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Number of nX5 zero-sum -1..1 arrays with rows and columns lexicographically nondecreasing
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1
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3, 130, 8312, 537572, 29859761, 1387552127, 54711391946, 1867753201968, 56202066220732, 1512619583145180, 36846458203653196, 820282579722532855, 16824341003927003916, 320094924612213368550, 5682193494807852979273
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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..0..0..1..1...-1.-1.-1..1..1...-1.-1..1..1..1...-1.-1..0..0..1
..1..0..0.-1.-1...-1..0..0.-1..1...-1..0.-1.-1..0....1..1.-1..0.-1
..1..0..0.-1..0....0..1..1.-1..1....1.-1..1..1..0....1..1..0..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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