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1, 1, 21, 105, 535, 2670, 12996, 59546, 266875, 1161894, 4939778, 20528320, 83636061, 334496221, 1315381029, 5091782355, 19424086781, 73092029218, 271537720562, 996656173345, 3616680935702, 12983391870459, 46133749660407, 162337625047433, 565962994479384, 1955721907216420, 6701061533668542, 22774651422340672
(列表;图表;参考;听;历史;文本;内部格式)
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