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A146184
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 87, 301, 1337, 5927, 24359, 118543, 715115, 5164241, 42357883, 353625469, 3347092839, 36905312969, 482588953149, 7069762004523, 114903134718451
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