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A146645
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 17, 39, 143, 759, 4705, 36573, 332389, 3601255, 48371515, 827745175, 17238229681, 441854255629, 13777843130457, 527986032874649, 24769703202602783
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