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A146598
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 31, 71, 203, 581, 2061, 8089, 33693, 163089, 819567, 4807311, 30022515, 215155907, 1673895429
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