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1, 1, 0, 1, 1, 3, 6, 19, 56, 213, 816, 3717, 17408, 92935, 513152, 3147495, 19993728, 138638825, 995169664, 7700244745, 61608152704, 526317901451, 4642742078336, 43407723925499, 418444180284544, 4250149857500861, 44444888840063360
(列表;图表;参考;听;历史;文本;内部格式)
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