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0, 1, 1, 2, 5, 12, 33, 90, 260, 763, 2302, 7035, 21854, 68581, 217485, 695229, 2238965, 7255380, 23643501, 77426852, 254678757, 841028918, 2787320206, 9267764857, 30906754731, 103350631437, 346465277423, 1164150100182, 3920004155435, 13225916804136
(列表;图表;参考;听;历史;文本;内部格式)
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