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1, 1, 1, 2, 6, 16, 46, 176, 722, 2906, 13106, 66716, 345676, 1849992, 10802156, 66543296, 418075036, 2750329276, 19145683612, 137410493656, 1012831509736, 7785886770656, 62105849642376, 507682088621632, 4271236045340056, 37171085370443576
(列表;图表;参考;听;历史;文本;内部格式)
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