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1, 2, 6, 18, 60, 216, 802, 3114, 12106, 48228, 194844, 798210, 3311822, 13798214, 58000532, 245438412, 1045431698, 4480601066, 19260873880, 83181717798, 360642829048, 1569483031218, 6855444787394, 30008135282956, 131734965740456, 579787205080918, 2558017177152502, 11313409371396034
(列表;图表;参考;听;历史;文本;内部格式)
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