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A146867
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 5, 9, 21, 33, 55, 141, 887, 2729, 13023, 38545, 182567, 834697, 7193987, 40372625, 350655929
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