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A146236
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 9, 17, 33, 89, 333, 849, 5379, 20923, 147329, 704405, 5858399, 36340527, 403495741, 3132269377, 47135996775, 474369570793, 8861603100211, 114644138972971
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