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A146660
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Number of n X n binary arrays symmetric under horizontal and vertical reflection 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, 1, 1, 1, 1, 17, 17, 73, 73, 521, 521, 7411, 7411, 207693, 207693, 7583663, 7583663, 399906057, 399906057
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