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2, 6, 19, 61, 196, 630, 2026, 6516, 20957, 67403, 216786, 697242, 2242518, 7212542, 23197479, 74609345, 239963764, 771788146, 2482278709, 7983677414, 25677658524, 82586271099, 265619708576, 854304579262, 2747673800490, 8837259564290, 28423008798464
(列表;图表;参考;听;历史;文本;内部格式)
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