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A147282
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 9, 29, 121, 541, 3221, 21119, 159497, 1485397, 18836335, 303422599, 5770504647
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