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1, 1, 1, 2, 4, 8, 17, 38, 82, 177, 376, 789, 1638, 3376, 6894, 13987, 28181, 56424, 112282, 222171, 437098, 855311, 1664755, 3223402, 6209505, 11901967, 22700056, 43083657, 81376732, 152971812, 286199220, 532954482, 987861697, 1822655134
(列表;图表;参考;听;历史;文本;内部格式)
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