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0, 0, 0, 1, 2, 10, 31, 134, 439, 1604, 5088, 17115, 54199, 176073, 552856, 1755516, 5472509, 17149688, 53191180, 165306987, 510614655, 1578127066, 4859554763, 14963066678, 45966984378, 141165413462, 432876102395, 1326862831744
(列表;图表;参考;听;历史;文本;内部格式)
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