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1, 1, 2, 6, 18, 59, 210, 771, 2934, 11472, 45768, 185861, 766004, 3196617, 13484009, 57423388, 246560056, 1066400837, 4642659695, 20329547786, 89487624762, 395791623498, 1758066178058, 7839884115870, 35087407624114, 157552832011704, 709617265586454, 3205147601026502, 14514588343290364
(列表;图表;参考;听;历史;文本;内部格式)
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