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A162093
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Number of nXn symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 3 ones in any row
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0
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2, 3, 9, 41, 205, 1190, 7529, 51751, 387737, 3113542, 26765060, 244702054, 2367701249, 24169612036, 259289525510, 2915165124175, 34258966408875
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