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1, 1, 4, 18, 104, 736, 6232, 61632, 698144, 8917120, 126807520, 1987075872, 34018221728, 631698903712, 12645901972000, 271482140140704, 6221487421328672, 151587364647728032, 3912949321334320672, 106670353381399285920, 3062317963564624162592, 92345208262957730327968
(列表;图表;参考;听;历史;文本;内部格式)
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