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1, 1, 2, 5, 13, 39, 121, 388, 1277, 4288, 14630, 50575, 176762, 623563, 2217379, 7939821, 28603591, 103600632, 377033451, 1378023887, 5056021292, 18615654196, 68758804039, 254706453524, 946038872000, 3522439937992, 13145057553230, 49157901220299
(列表;图表;参考;听;历史;文本;内部格式)
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