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Search: id:A162117
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| A162117 |
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Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 9 ones in any row or column |
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+0
1
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| 2, 4, 9, 56, 499, 8000, 207554, 9382078, 732814910, 100881440613, 23970739627607, 9428485931810668
(list; graph; listen)
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