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A146854
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 5, 21, 55, 223, 1323, 7243, 56001, 498505, 5857355, 89335203, 1598206021, 35814813801
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