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1, 4, 16, 82, 458, 3228, 24036, 212448, 2032992, 21781440, 246853440, 3201742080, 42580650240, 621037186560, 9664270963200, 161166707251200, 2781679603046400, 52204357423411200, 1004687538456268800, 20823621371578368000, 447027656835852288000
(列表;图表;参考;听;历史;文本;内部格式)
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