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1, 2, 4, 9, 24, 77, 294, 1296, 6403, 34644, 201932, 1253513, 8219110, 56578239, 406990651, 3048202700, 23700070773, 190830842843, 1588016365186, 13633603416558, 120574656241999, 1097006289005674, 10255338612462641, 98403208150304070, 968186766428157206, 9759036265967791137, 100690787844977985900, 1062601625749170026894, 11461320511629994319890
(列表;图表;参考;听;历史;文本;内部格式)
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