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4, 9, 20, 44, 96, 209, 455, 990, 2154, 4686, 10194, 22176, 48241, 104942, 228287, 496607, 1080300, 2350043, 5112193, 11120867, 24191904, 52626132, 114480851, 249037213, 541745915, 1178493097, 2563648273, 5576861234, 12131688091, 26390804748, 57409535261
(列表;图表;参考;听;历史;文本;内部格式)
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