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A147219
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0101 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 17, 37, 107, 651, 4763, 31885, 243507, 2726593, 39573223, 647861719, 12294997893, 299566536047, 9265546813073, 344823799726629
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