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Search: id:A144055
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| A144055 |
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Number of n X n binary arrays, symmetric about main diagonal, with every 1 adjacent to at least one other 1, but at most one 1 adjacent horizontally and at most one 1 adjacent vertically. |
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| 1, 4, 13, 75, 765, 12167, 294579, 11514473, 740527130, 74320148705, 11850151989347, 3053892893918393, 1251352342040855094, 814829245618611538573, 849714505582240228227866
(list; graph; listen)
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