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1, 1, 2, 5, 13, 41, 132, 470, 1730, 6649, 26122, 104814, 426257, 1754055, 7282630, 30470129, 128304158, 543303752, 2311904374, 9880776407, 42394198909, 182537610058, 788473887942, 3415782381520, 14837307126498, 64608442956047, 281975101347994, 1233237605651194
(列表;图表;参考;听;历史;文本;内部格式)
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