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A147181
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0101 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 17, 37, 129, 675, 4545, 33673, 284663, 3050875, 41150087, 686710451, 13852947253, 339116701643, 10235218350849, 379099740909573
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