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6, 21, 75, 267, 951, 3328, 11576, 40309, 140298, 487872, 1695490, 5890943, 20469215, 71122969, 247110741, 858548734, 2982886197, 10363606865, 36006690099, 125099226783, 434636165827, 1510070809645, 5246488474683, 18228043608602
(列表;图表;参考;听;历史;文本;内部格式)
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