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1, 1, 2, 5, 15, 52, 188, 696, 2606, 9800, 36931, 139303, 525658, 1983925, 7488281, 28265353, 106692425, 402731694, 1520195297, 5738304135, 21660476556, 81762200416, 308629323572, 1164989004846, 4397506361848, 16599351862867, 62657893108843, 236515956134402
(列表;图表;参考;听;历史;文本;内部格式)
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