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1, 1, 3, 10, 35, 135, 541, 2217, 9377, 40349, 175942, 778143, 3477104, 15671149, 71188693, 325532865, 1497282449, 6922353003, 32148253707, 149919105537, 701702507444, 3295012665703, 15519855244683, 73301505108780, 347061046971505, 1647058682479621, 7833160088904523, 37325460274234458
(列表;图表;参考;听;历史;文本;内部格式)
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