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2, 2, 6, 26, 182, 1786, 22870, 359226, 6658038, 141860538, 3411462102, 91331548410, 2692998369270, 86698082609658, 3025579919280726, 113759391284411322, 4584343174947333366, 197110924461251852346, 9006669123611196569046, 435827319931153165710714
(列表;图表;参考;听;历史;文本;内部格式)
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