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A162114
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Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 6 ones in any row or column
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0
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2, 4, 9, 56, 499, 8000, 200367, 7707352, 406328329, 28320262170, 2490234078408, 267515727878427
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OFFSET
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1,1
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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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