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1, 1, 5, 17, 69, 285, 1233, 5359, 23959, 107925, 491337, 2256035, 10436057, 48518807, 226804345, 1064891773, 5018350417, 23729155959, 112551561343, 535260211983, 2551688206089, 12191552706353, 58365723069747, 279927193571759, 1344828850286155, 6470867761444667, 31180041296193907, 150441587819334189
(列表;图表;参考;听;历史;文本;内部格式)
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