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Search: id:A144240
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| A144240 |
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Number of n X n binary arrays, symmetric about both diagonal and antidiagonal, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise. |
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1
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| 1, 2, 1, 5, 4, 10, 32, 89, 174, 2023, 3612, 30003, 170438, 1387640, 7339317, 153956133, 877660696, 18345445123, 211690980458, 5237531076262
(list; graph; listen)
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