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1, 2, 7, 26, 103, 426, 1817, 7905, 34999, 156978, 711572, 3254200, 14992984, 69508490, 324005487, 1517421717, 7135832181, 33679784580, 159477986279, 757336398740, 3605893799280, 17209257753242, 82307977414514, 394432975779016, 1893578180925439, 9105600973099922, 43852562469867462, 211491091134032890
(列表;图表;参考;听;历史;文本;内部格式)
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