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1, 2, 6, 25, 112, 557, 2914, 15837, 88531, 505581, 2936676, 17294352, 103018292, 619595991, 3757342674, 22948207189, 141033508661, 871527612640, 5412015056754, 33754524947592, 211353845133650, 1328099943458743, 8372466442163468, 52936608451071755
(列表;图表;参考;听;历史;文本;内部格式)
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