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1, 1, 3, 13, 70, 440, 3116, 24274, 204407, 1836339, 17425275, 173329307, 1796783304, 19323703019, 214843877103, 2462522274426, 29032815570544, 351447240945518, 4361579736404011, 55424256247911490, 720399315622779670, 9569215299494074698, 129799982362958621827
(列表;图表;参考;听;历史;文本;内部格式)
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