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A147400
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 7, 15, 29, 107, 505, 2403, 11235, 68883, 550857, 5140463, 52360741, 625116575, 9135765233, 158905603757, 3203687852735, 75422308943617
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