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4, 2, 2, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4, 5, 6, 9, 12, 17, 24, 36, 53, 79, 120, 185, 288, 454, 720, 1156, 1872, 3058, 5040, 8377, 14035, 23699, 40320, 69107, 119293, 207359, 362880, 639233, 1133279, 2021747, 3628800, 6552135, 11899424, 21733774, 39916800
(列表;图表;参考;听;历史;文本;内部格式)
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