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1, 1, 3, 9, 27, 79, 229, 657, 1873, 5304, 14944, 41895, 116947, 325133, 900617, 2486183, 6841490, 18770754, 51358188, 140154540, 381540434, 1036261537, 2808328337, 7594958401, 20499680869, 55227373266, 148520150761, 398726637407, 1068701794158, 2859956501816, 7642086948143, 20391083977989, 54333644617311
(列表;图表;参考;听;历史;文本;内部格式)
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