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1, 1, 6, 19, 92, 380, 1858, 8531, 42322, 205486, 1036242, 5197028, 26600656, 136247450, 706258300, 3671453391, 19233967034, 101105026444, 534364343102, 2833591923458, 15087564248648, 80576221523390, 431730827926256, 2319409832695016, 12494373170976880, 67463786953484884, 365108831177564780
(列表;图表;参考;听;历史;文本;内部格式)
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