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1, 1, 4, 6, 26, 45, 204, 380, 1771, 3450, 16380, 32886, 158224, 324632, 1577532, 3290040, 16112057, 34034715, 167710664, 357919100, 1772645420, 3815041230, 18974357220, 41124015036, 205263418941, 447534498320, 2240623268512, 4910258796240, 24648785802336, 54257308779600
(列表;图表;参考;听;历史;文本;内部格式)
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