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0, 1, 4, 17, 70, 282, 1136, 4583, 18457, 74131, 296945, 1190344, 4773949, 19145523, 76751393, 307503585, 1231182078, 4929075135, 19736248104, 79031964989, 316476142454, 1267191674419, 5073155081395, 20306187559891, 81265371486027
(列表;图表;参考;听;历史;文本;内部格式)
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