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1, 1, 1, 1, 1, 1, 1, 7, 28, 84, 210, 462, 924, 1758, 3444, 7602, 19278, 52458, 142044, 368130, 905136, 2130198, 4895919, 11280885, 26685540, 65491062, 165584034, 423910572, 1080774261, 2717940687, 6731334225, 16494155097, 40308269022
(列表;图表;参考;听;历史;文本;内部格式)
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