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A162058
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Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 3 ones in any row or column
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0
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2, 6, 18, 77, 363, 2049, 12734, 88165, 657807, 5333430, 46068228, 424836442, 4143278352, 42649790768, 461486812345, 5232359427722, 62011437997666
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