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A147234
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 7, 19, 49, 195, 1111, 7177, 51609, 452845, 5123643, 72369101, 1214915609, 24818665423, 626087799933, 19508645488885, 741333829643879
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