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1, 2, 9, 32, 140, 630, 2870, 13256, 61389, 286710, 1346004, 6351516, 30088071, 142997456, 681498600, 3255674016, 15585877627, 74752865964, 359121640259, 1727811098500, 8323912135434, 40149494252802, 193868148499388, 937055479499472, 4533362484840700
(列表;图表;参考;听;历史;文本;内部格式)
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