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A146174
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-100-111 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 13, 31, 79, 513, 4397, 30071, 246251, 3267201, 56899771, 1043804543, 23549434373, 739313753641, 29199724578735, 1349766896974211, 78078882718269849, 5907673396173869799
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