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0, 0, 1, 1, 2, 2, 5, 6, 3, 14, 12, 4, 30, 20, 5, 55, 30, 6, 91, 42, 7, 140, 56, 8, 204, 72, 9, 285, 90, 10, 385, 110, 11, 506, 132, 12, 650, 156, 13, 819, 182, 14, 1015, 210, 15, 1240, 240, 16, 1496, 272, 17, 1785, 306, 18, 2109, 342, 19, 2470, 380, 20, 2870, 420, 21, 3311, 462, 22, 3795, 506
(列表;图表;参考;听;历史;文本;内部格式)
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