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1, 1, 6, 25, 78, 258, 800, 2463, 7344, 21511, 61677, 173980, 483319, 1323470, 3577605, 9553658, 25227727, 65918419, 170552866, 437196640, 1110945961, 2799689792, 7000246591, 17372882671, 42809388080, 104774554942, 254771953179, 615667051237, 1478934870484, 3532347875968
(列表;图表;参考;听;历史;文本;内部格式)
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