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1, 1, 2, 4, 9, 21, 55, 146, 415, 1212, 3653, 11246, 35346, 112750, 364714, 1193202, 3943557, 13148575, 44186841, 149536376, 509270554, 1744342614, 6005869285, 20777091355, 72192026878, 251848377631, 881865312582, 3098564357293, 10922162622233, 38614641384893
(列表;图表;参考;听;历史;文本;内部格式)
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