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A147335
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 43, 105, 255, 713, 2327, 7879, 28233, 105483, 441751, 1976665, 9809483, 52365589, 307831711
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