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1, 4, 16, 64, 252, 996, 3936, 15552, 61452, 242820, 959472, 3791232, 14980572, 59193828, 233896896, 924213888, 3651913836, 14430073860, 57018604752, 225301777344, 890251367868, 3517715249892, 13899805185312, 54923315409216, 217022507533260, 857536884383364, 3388448121977520, 13389022541682432, 52905022644129948, 209047479923369700
(列表;图表;参考;听;历史;文本;内部格式)
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