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A147216
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.
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0
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1, 1, 1, 1, 5, 21, 61, 299, 1693, 11273, 84165, 889613, 11762051, 208288599, 4127254537, 109970171123
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