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A146673
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0110 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 17, 51, 293, 1459, 7621, 56935, 702993, 8365419, 152139369, 2979251133
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