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A146662
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation.
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1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 41, 133, 407, 1175, 4535, 22999, 120797, 662265, 4237243, 30856447, 236921167, 2042840001, 20458483743, 233380921399
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