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1, 1, 4, 8, 23, 54, 143, 354, 914, 2306, 5907, 15012, 38368, 97804, 249865, 637834, 1629729, 4163398, 10640753, 27196246, 69526562, 177757762, 454541197, 1162403180, 2972953385, 7604223184, 19451741733, 49761433640, 127308417226
(列表;图表;参考;听;历史;文本;内部格式)
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