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1, 1, 3, 7, 16, 35, 76, 155, 334, 691, 1427, 2928, 5985, 12181, 24718, 50052, 101060, 203767, 410240, 824943, 1657225, 3326530, 6672880, 13378262, 26809661, 53706442, 107555030, 215342201, 431063039, 862743300, 1726491928, 3454620480, 6911903675, 13828137410
(列表;图表;参考;听;历史;文本;内部格式)
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