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1, 1, 4, 13, 40, 124, 385, 1195, 3709, 11512, 35731, 110902, 344218, 1068385, 3316057, 10292389, 31945552, 99152713, 307750528, 955197136, 2964744121, 9201982891, 28561145809, 88648181548, 275146527535, 854000728414, 2650650366790, 8227097627905, 25535293612129
(列表;图表;参考;听;历史;文本;内部格式)
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