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1, 1, 4, 12, 48, 172, 704, 2832, 12048, 51167, 222291, 972073, 4314357, 19287153, 86967804, 394239816, 1798586922, 8247848422, 38011507458, 175879906285, 816790596799, 3806042455632, 17792597421918, 83419217824454, 392122329044956, 1847566010330373, 8724681867410249, 41287279746464866
(列表;图表;参考;听;历史;文本;内部格式)
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