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1, 1, 5, 16, 50, 163, 524, 1687, 5435, 17503, 56372, 181558, 584741, 1883272, 6065441, 19534921, 62915981, 202633048, 652618802, 2101884691, 6769524932, 21802560343, 70219349555, 226154954935, 728375639564, 2345874192598, 7555340168693, 24333429833872
(列表;图表;参考;听;历史;文本;内部格式)
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