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2, 1, 3, 6, 12, 24, 66, 168, 408, 1014, 2820, 7656, 20370, 54096, 154416, 430710, 1182504, 3258816, 9377922, 26651328, 74941608, 210709446, 612566616, 1760983512, 5017273554, 14308403856, 41833393896, 121321861350, 349444725492, 1006135834560
(列表;图表;参考;听;历史;文本;内部格式)
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