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A146819
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111 pattern in any orientation.
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1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 39, 117, 351, 957, 3341, 15997, 83175, 424759, 2415699, 15982837, 113541201, 873618675
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