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Search: id:A144059
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| A144059 |
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Number of n X n binary arrays, symmetric under 180 degree rotation, 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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+0
1
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| 1, 2, 7, 43, 317, 4395, 85883, 3189035, 155707292, 14992855085, 1844750664909, 446183107764907, 140966932321586720
(list; graph; listen)
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