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A162119
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Number of nXn binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order, and no more than 2 ones in any row or column
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0
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2, 4, 16, 67, 327, 1827, 11291, 76436, 560922, 4424644, 37272300, 333474298, 3154416275, 31423894296, 328562851763
(list; graph; refs; listen; history; internal format)
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