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1, 1, 2, 2, 7, 19, 39, 120, 411, 1310, 3862, 11059, 31849, 89615, 247305, 674579, 1812940, 4806211, 12576930, 32509641, 83052304, 209808493, 524424707, 1297623584, 3179903180, 7721053410, 18582920108, 44349211490, 104989527861, 246624184465, 575024282279
(列表;图表;参考;听;历史;文本;内部格式)
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