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1, 1, 3, 14, 83, 570, 4318, 35068, 299907, 2668994, 24513578, 230981316, 2222973742, 21777680644, 216603095388, 2182653550712, 22245324259811, 228995136248850, 2378208988952434, 24893925007653748, 262424206657706682, 2784074166633171596, 29707452318776988260, 318664451642694840264
(列表;图表;参考;听;历史;文本;内部格式)
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