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1, 18, 164, 1050, 5367, 23232, 88125, 299992, 932849, 2685747, 7235237, 18392853, 44427807, 102552852, 227298680, 485679518, 1003915611, 2013360324, 3927664296, 7469755903, 13876848040, 25225619858, 44939663514, 78569415198, 134974052794, 228088973049
(列表;图表;参考;听;历史;文本;内部格式)
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