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1, 3, 9, 54, 270, 1620, 9828, 61884, 397062, 2597508, 17232831, 115722918, 784996434, 5371325217, 37029240315, 256948639344, 1793271890988, 12579466538187, 88645665923244, 627235978623318, 4454619888380355, 31743030458459169, 226890102674671245
(列表;图表;参考;听;历史;文本;内部格式)
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