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A146638
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0100 pattern in any orientation.
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1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 57, 181, 727, 3143, 12709, 46177, 203713, 1168453, 7869343, 57494841, 429662591, 3357500475
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