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1, 2, 7, 26, 108, 452, 1994, 8845, 40271, 184235, 855223, 3985965, 18744281, 88440574, 419747961, 1997680208, 9546471924, 45725577789, 219672576950, 1057375409941, 5101190127636, 24650121338944, 119328509102064, 578453160526799, 2808152514137111, 13648520420291810, 66415602018946462
(列表;图表;参考文献;听;历史;文本;内部格式)
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