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1, 1, 1, 2, 4, 9, 17, 38, 89, 213, 480, 1151, 2810, 6978, 16497, 40731, 101680, 256491, 623916, 1568966, 3972773, 10130647, 25044032, 63573638, 162478685, 417322917, 1049096179, 2687278965, 6917001254, 17882746627, 45391766669, 116995255065, 302689722551
(列表;图表;参考;听;历史;文本;内部格式)
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