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Search: id:A145764
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| A145764 |
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally. |
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+0
1
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| 1, 1, 5, 5, 24, 73, 566, 2483, 32841, 234437, 5307036, 61459976, 2279718182, 44700555075, 2739362168120, 88170556642974, 8988213154883058
(list; graph; listen)
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