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1, 2, 5, 15, 48, 166, 596, 2221, 8472, 32995, 130507, 523100, 2119454, 8667529, 35727261, 148285069, 619172847, 2599212499, 10963049307, 46437309218, 197454056586, 842504023722, 3606195947971, 15480329150558, 66628688247862, 287475949517326, 1243140817965661
(列表;图表;参考;听;历史;文本;内部格式)
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