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A162092
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Number of nXn symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 2 ones in any row
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0
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2, 3, 7, 16, 41, 109, 298, 858, 2533, 7773, 24438, 79079, 261961, 888335, 3078307, 10884541, 39246121, 144089532, 538426333, 2045444718, 7895980672, 30947906902, 123093837504, 496552331743, 2030469580356
(list; graph; refs; listen; history; internal format)
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