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A146661
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 9, 23, 67, 379, 2563, 18843, 171357, 2142397, 34085501, 656314291, 15909337201, 492190457043, 19216875516479, 939930272232161
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