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2, 5, 16, 51, 180, 685, 2735, 11243, 47120, 199945, 855484, 3679681, 15882263, 68701955, 297607842, 1290360591, 5597964012, 24294536389, 105460450143, 457862871585, 1988029384006, 8632497563339, 37485816423762, 162782662033991
(列表;图表;参考;听;历史;文本;内部格式)
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