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1, 9, 45, 165, 495, 1287, 3003, 6435, 12870, 24311, 43776, 75753, 127110, 209475, 346104, 591261, 1081575, 2163150, 4686826, 10656387, 24582663, 56191734, 125640180, 273241161, 577147212, 1184959314, 2369918628, 4631710931, 8881943832, 16798969548, 31537530456
(列表;图表;参考;听;历史;文本;内部格式)
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