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1, 1, 3, 4, 11, 53, 146, 366, 1563, 5837, 16720, 59917, 246090, 828157, 2773984, 11056545, 41539923, 142602611, 536781500, 2103092222, 7632057148, 27948758125, 108960963441, 413531196001, 1523673835870, 5833675306068, 22596747340839, 85028853983908, 322415760345476
(列表;图表;参考;听;历史;文本;内部格式)
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