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1, 1, 2, 4, 8, 18, 44, 104, 246, 620, 1600, 4082, 10436, 27360, 73046, 193296, 509984, 1371214, 3727792, 10065872, 27145058, 74142688, 204005440, 558475342, 1527058912, 4213709856, 11694035010, 32331790700, 89266126856, 248240818282, 693599213260
(列表;图表;参考;听;历史;文本;内部格式)
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