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A146427
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 15, 29, 65, 155, 571, 2003, 10561, 41709, 230027, 1186171, 9353621, 63521901, 612736753, 4999574693, 59290750729, 622330543047
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