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1, 1, 1, 1, 7, 31, 121, 806, 5706, 40902, 345444, 3627834, 44916840, 473882124, 5607925896, 73429902300, 1169960275680, 18289685306640, 315392669158416, 5046227338720884, 98328156602878800, 1862418125263338720, 36536960773307025360, 777453614193997039320
(列表;图表;参考;听;历史;文本;内部格式)
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