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A139674
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Number of n X n symmetric binary matrices with all row sums 7.
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3
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1, 764, 708256, 805036704, 1127512146540, 1966499966796816, 4274712091685443584, 11528251571501588791296, 38295413179145036856212700, 155411811543624388078758718000, 763997249847515085736557734880512, 4511824317564827934662170498445281792
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OFFSET
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7,2
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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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EXTENSIONS
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STATUS
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approved
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