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A147477
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-1100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 9, 19, 52, 181, 742, 4149, 26078, 174469, 1396213, 13529455
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