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1, 2, 8, 24, 80, 224, 704, 1920, 5632, 15360, 43008, 114688, 315392, 827392, 2211840, 5767168, 15138816, 38928384, 100925440, 256901120, 657457152, 1660944384, 4202692608, 10527703040, 26424115200, 65699577856, 163477192704, 403995361280, 998043025408
(列表;图表;参考;听;历史;文本;内部格式)
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