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2, 8, 31, 94, 305, 950, 2901, 8728, 26068, 77326, 228367, 671446, 1967328, 5745190, 16730555, 48594066, 140815777, 407186706, 1175159395, 3385527188, 9737463217, 27964574958, 80197812317, 229694924100, 657073271390, 1877519404364
(列表;图表;参考;听;历史;文本;内部格式)
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