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A147235
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 31, 65, 185, 517, 1673, 6585, 26113, 126591, 608081, 3381041, 20245821, 136182387
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