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A146878
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 9, 41, 249, 1137, 4177, 27849, 254297, 2360945, 31718257, 561884345, 12949529033, 316511614977
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