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1, 3, 12, 51, 225, 1018, 4682, 21792, 102357, 484186, 2303423, 11009216, 52822832, 254278092, 1227475473, 5939756449, 28803320496, 139934359516, 680961029062, 3318631373717, 16194557374944, 79121838008508, 386983559520381, 1894591409599364, 9283866303696064, 45530276736993243, 223460832994759113
(列表;图表;参考;听;历史;文本;内部格式)
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