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1, 1, 1, 4, 8, 38, 206, 1200, 7244, 55112, 481108, 4287064, 42556692, 458857096, 5380649292, 66715285656, 886324380896, 12515424567584, 187185185162008, 2950679797693984, 48999725880417856, 854663308052386560, 15612043048565029376, 298116231774768917120
(列表;图表;参考;听;历史;文本;内部格式)
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