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Search: id:A147146
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| A147146 |
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation. |
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1
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| 1, 1, 1, 1, 3, 9, 19, 67, 271, 1339, 7503, 48863, 386667, 3842993, 45897369, 657696677
(list; graph; listen)
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