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Search: id:A144243
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| A144243 |
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Number of n X n binary arrays, symmetric under 90 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, 3, 2, 10, 36, 77, 170, 1539, 2778, 26239, 152082, 1317122, 7797811, 129473317, 857792500, 17986500145, 205469564882
(list; graph; listen)
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