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1, 1, 2, 4, 7, 17, 31, 76, 156, 352, 784, 1674, 3962, 8129, 20173, 43193, 103522, 230536, 535294, 1231484, 2787700, 6591350, 14613710, 35369380, 77886902, 190329098, 428113940, 1027180798, 2353823912, 5559635866, 12950837432
(列表;图表;参考文献;听;历史;文本;内部格式)
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