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1, 4, 20, 128, 1040, 10432, 125248, 1753600, 28057856, 505041920, 10100839424, 222218469376, 5333243269120, 138664325005312, 3882601100165120, 116478033004986368, 3727297056159629312, 126728099909427527680, 4562211596739391258624, 173364040676096868352000, 6934561627043874735128576
(列表;图表;参考;听;历史;文本;内部格式)
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