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1, 1, 3, 7, 21, 53, 159, 419, 1257, 3401, 10203, 28095, 84285, 235005, 705015, 1984155, 5952465, 16873745, 50621235, 144327287, 432981861, 1240296773, 3720890319, 10700364691, 32101094073, 92619680089, 277859040267, 803956981807, 2411870945421, 6995553520653, 20986660561959, 61001041404555
(列表;图表;参考;听;历史;文本;内部格式)
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