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1, 1, 2, 5, 14, 42, 132, 428, 1417, 4757, 16119, 54963, 188219, 646460, 2224944, 7668915, 26461005, 91371594, 315689675, 1091166442, 3772747245, 13047503222, 45131078409, 156129312025, 540181837728, 1869097588540, 6467740095295
(列表;图表;参考;听;历史;文本;内部格式)
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