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1, 3, 9, 25, 66, 170, 431, 1076, 2665, 6560, 16067, 39219, 95476, 231970, 562736, 1363640, 3301586, 7988916, 19322585, 46722160, 112955614, 273063236, 660116215, 1595906490, 3858740567, 9331539319, 22570697689, 54605064084, 132137719127, 319841444030
(列表;图表;参考;听;历史;文本;内部格式)
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