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0, 0, 0, 1, 2, 12, 53, 250, 1115, 5012, 22032, 96746, 422732, 1848128, 8088090, 35498533, 156328706, 691192578, 3068780449, 13683070474, 61267204610, 275455737555, 1243320744572, 5633022679582, 25611815936218, 116840427373176, 534705818846660, 2454282243059471
(列表;图表;参考;听;历史;文本;内部格式)
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