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A146686
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1000-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 31, 63, 167, 435, 1337, 5021, 19355, 85901, 388093, 1971221, 10932161
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