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1, 1, 2, 5, 10, 28, 70, 170, 340, 960, 2688, 7308, 18270, 48440, 117640, 285600, 571200, 1543600, 4358400, 12038400, 33707520, 92875776, 252506016, 677656224, 1694140560, 4596220440, 12186147680, 32083749600, 77917677600, 203473437920, 493981756800, 1217092396800, 2434184793600, 6357547392000, 17180514976000, 46002675920000, 129889908480000,349123704576000
(列表;图表;参考;听;历史;文本;内部格式)
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