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1, 2, 0, 1, 6, 12, 11, 30, 120, 252, 408, 1104, 3415, 7710, 15984, 42609, 118422, 281820, 657468, 1732008, 4608288, 11375240, 28100400, 73598112, 192776895, 487507038, 1239516384, 3241480275, 8460205842, 21733941060, 56121723411, 146904032622, 383900676120
(列表;图表;参考;听;历史;文本;内部格式)
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