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A162060
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Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 5 ones in any row or column
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0
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2, 6, 18, 100, 794, 10414, 190428, 4659387, 143848365, 5430367157, 242216815664, 12631766954130, 754181337363809
(list; graph; refs; listen; history; internal format)
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