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1, 1, 2, 5, 13, 37, 111, 345, 1104, 3611, 12016, 40548, 138414, 477076, 1657956, 5802920, 20436910, 72369903, 257518806, 920333307, 3302003826, 11888979066, 42944410207, 155576009845, 565127618392, 2057903975752, 7510967300206
(列表;图表;参考;听;历史;文本;内部格式)
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