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A162057
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Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 2 ones in any row or column
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0
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2, 6, 13, 34, 86, 233, 652, 1888, 5683, 17526, 55868, 182024, 609103, 2081152, 7268823, 25891230, 93983793, 347398900, 1306005890, 4991876362, 19377811110, 76372139937, 305348766558, 1238006401576, 5086973436072
(list; graph; refs; listen; history; internal format)
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