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A147408
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1001-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 13, 25, 49, 175, 865, 4191, 18461, 94551, 650857, 5436423, 49032533, 472638523, 5306220921, 72329183333, 1150334935553, 20498079126697, 410408073960755
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