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A146718
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 7, 13, 27, 41, 107, 327, 1681, 5451, 24597, 80545, 454313, 2226033, 18080203, 106915629
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