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A162074
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Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and an even number of ones in each row
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0
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1, 2, 3, 8, 31, 187, 2283, 42743, 1641965, 103253028, 12810578372, 2750743641417, 1126452639815250, 830354090187673737, 1152099822267599547753
(list; graph; refs; listen; history; internal format)
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