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1, 4, 17, 76, 355, 1724, 8671, 45028, 240809, 1323460, 7461121, 43079084, 254388667, 1534503676, 9445067375, 59263320964, 378729294481, 2463130313348, 16290919259569, 109500022678540, 747527556645971, 5180110680154684, 36418521410184127, 259636520604139556
(列表;图表;参考;听;历史;文本;内部格式)
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