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1, 1, 1, 2, 4, 9, 20, 48, 114, 282, 701, 1763, 4438, 11212, 28287, 71357, 179696, 451946, 1134720, 2844954, 7122041, 17805884, 44459523, 110882964, 276241029, 687501846, 1709406423, 4246490811, 10540185493, 26140852721, 64782959403
(列表;图表;参考;听;历史;文本;内部格式)
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