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A147213
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal 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, 1, 1, 1, 3, 9, 19, 39, 117, 361, 955, 3303, 16663, 85069, 434621, 2513479, 17082851, 120871405, 925679621
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