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A147271
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 9, 23, 45, 169, 1061, 6743, 40273, 284761, 2852385, 36414365, 522818739, 8493813357, 169218922641
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