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1, 1, 3, 14, 80, 516, 3608, 26729, 206808, 1655232, 13612512, 114466491, 980575020, 8533242324, 75267759072, 671721353474, 6056517394512, 55104831724236, 505422858053560, 4669306663437888, 43418090784597696, 406109012334694211, 3818890067546807794
(列表;图表;参考;听;历史;文本;内部格式)
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