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Search: id:A146067
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| A146067 |
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. |
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| 1, 1, 1, 1, 1, 1, 1, 5, 9, 17, 41, 117, 275, 1237, 4103, 20885, 85925, 519635, 2644535, 20312399, 128516271, 1266040749, 10025925703, 122157386121, 1211481473503, 18256047371395, 225812595799851, 4272679708033791, 65914771408101775
(list; graph; listen)
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