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A146581
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1100-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 11, 31, 107, 597, 4235, 35993, 378513, 5151733, 87563339, 1913743005, 52850470565, 1858867426265, 81756583423405, 4581414733191763, 324047679491641949, 29188263592896961077
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