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1, 1, 7, 28, 231, 2100, 23884, 285390, 3626295, 47813815, 650367788, 9066061200, 128987761308, 1866877313448, 27417589615234, 407771633434368, 6131640607962135, 93096368350684727, 1425633586192690945, 21998953427963954554, 341803227016091180620
(列表;图表;参考文献;听;历史;文本;内部格式)
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