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1, 0, 24, 54, 492, 1944, 11976, 57024, 313440, 1587168, 8417472, 43483392, 227995008, 1185394176, 6192642048, 32263570944, 168350991360, 877689686016, 4578049517568, 23872537976832, 124504626978816, 649282059657216, 3386128302882816, 17658788068196352
(列表;图表;参考;听;历史;文本;内部格式)
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