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1, 2, 3, 6, 13, 28, 62, 144, 338, 810, 1970, 4852, 12073, 30334, 76805, 195850, 502461, 1296122, 3359527, 8745744, 22856223, 59944156, 157718380, 416189954, 1101204387, 2920914484, 7765357967, 20688204244, 55225188289, 147688302518
(列表;图表;参考;听;历史;文本;内部格式)
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