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A172607
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Number of 7*n X 3*n 0..1 arrays with row sums 3 and column sums 7.
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1
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1, 1026608414145600, 58142871081888953760431694254592000, 3201055426099561623149772782827411540384767799931904000000, 32039970364449358738657145679393908929276464603866377637139985914971871928320000000
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OFFSET
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1,2
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LINKS
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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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