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A146187
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.
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0
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1, 1, 1, 1, 9, 39, 227, 1199, 6097, 63869, 840409, 12862601, 284127507, 7552975051, 252656207179, 10547338792841
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