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Search: id:A144244
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| A144244 |
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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 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise. |
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+0
1
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| 1, 2, 1, 9, 24, 94, 870, 7731, 58940, 1518701, 25116276, 780979887, 31966477480
(list; graph; listen)
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