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A146239
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-001 pattern in any orientation.
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0
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1, 1, 1, 1, 9, 41, 201, 1157, 6733, 60161, 712733, 11701425, 239309475, 6797981481, 227189935315, 9296498773239, 488912114784905
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