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1, 6, 18, 54, 150, 426, 1158, 3204, 8682, 23724, 64194, 174378, 470856, 1274430, 3434826, 9272346, 24953004, 67230288, 180705126, 486152604, 1305430884, 3507947838, 9412114986, 25268587338, 67752451146, 181754458194, 487060621596, 1305761069730, 3497441209182
(列表;图表;参考;听;历史;文本;内部格式)
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