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A146873
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Number of n X n binary arrays symmetric under horizontal and vertical reflection 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, 1, 1, 1, 17, 17, 49, 49, 129, 129, 2097, 2097, 70513, 70513, 1502401, 1502401, 23706401, 23706401
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