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1, 1, 2, 7, 22, 74, 271, 1012, 3858, 15046, 59579, 238825, 967873, 3958517, 16316594, 67716000, 282719162, 1186633647, 5004102122, 21192022233, 90089538788, 384305738731, 1644544501988, 7057705570877, 30368821119351, 130993073168419, 566297366630412, 2453269044761359
(列表;图表;参考;听;历史;文本;内部格式)
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