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1, 1, 1, 1, 3, 15, 57, 167, 423, 1099, 3391, 11855, 41149, 134185, 418859, 1313861, 4285349, 14456605, 49097477, 164889821, 548126215, 1824046555, 6131204373, 20817947419, 70988707243, 241907381783, 823235370195, 2804366824235
(列表;图表;参考;听;历史;文本;内部格式)
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