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1, 4, 18, 96, 265, 672, 1617, 3776, 8577, 19080, 41745, 90048, 191945, 404992, 846945, 1757440, 3621697, 7417800, 15109313, 30623520, 61788489, 124158496, 248549937, 495852480, 986076225, 1955203016, 3866245425, 7625813888, 15005718153
(列表;图表;参考;听;历史;文本;内部格式)
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