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A162061
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Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 6 ones in any row or column
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0
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2, 6, 18, 100, 794, 11268, 252987, 8945756, 446201625, 30067026570, 2590515855716, 274837925289083
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