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1, 1, 4, 12, 39, 142, 545, 2106, 8382, 34215, 142643, 600014, 2557631, 11028505, 48020121, 210769413, 931363949, 4143384678, 18544445680, 83436432216, 377186393627, 1712438625809, 7806272131532, 35718243832372, 163985930358341, 755228559001683, 3488271916047151, 16155889488916942
(列表;图表;参考;听;历史;文本;内部格式)
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