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1, 1, 3, 14, 88, 670, 6170, 66360, 815640, 11272800, 173132400, 2925014400, 53909394000, 1076365290000, 23144112591600, 533193460800000, 13102608591072000, 342105146182800000, 9457689380931792000, 275988880808825184000, 8477631163592791200000, 273430368958004818560000, 9238944655686318693120000
(列表;图表;参考;听;历史;文本;内部格式)
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