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1, 6, 35, 154, 613, 2882, 14995, 68730, 291606, 1378110, 7047087, 32801046, 143237183, 681449778, 3462931356, 16261134650, 72210836920, 345094694354, 1747534150303, 8253521588404, 37063741964059, 177681801860358, 897584067273979, 4256535683245074, 19269823577105032
(列表;图表;参考;听;历史;文本;内部格式)
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