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1, 2, 4, 10, 26, 78, 236, 770, 2520, 8606, 29364, 103302, 362226, 1298882, 4645670, 16897224, 61296686, 225457006, 826950080, 3067763394, 11353597198, 42414220022, 158095481910, 594108418428, 2227714454332, 8412269224862, 31704876569698, 120223392641084, 455053649594196, 1731861709709542, 6579658381972974
(列表;图表;参考;听;历史;文本;内部格式)
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