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1, 1, 1, 1, 4, 10, 20, 47, 128, 340, 868, 2275, 6188, 16922, 46112, 126613, 351568, 981622, 2747876, 7723250, 21811856, 61828886, 175752728, 500984606, 1432111244, 4104175970, 11787811340, 33926475162, 97837209036, 282662156478, 818022923184, 2371103693427
(列表;图表;参考;听;历史;文本;内部格式)
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