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1, 7, 27, 82, 221, 553, 1323, 3078, 7019, 15765, 34992, 76922, 167697, 363020, 780937, 1670786, 3557060, 7539856, 15918972, 33490067, 70226358, 146822144, 306121101, 636648253, 1320964417, 2734901341, 5650875038, 11653922283, 23991828701, 49310264440
(列表;图表;参考;听;历史;文本;内部格式)
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