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1, 1, 2, 5, 13, 38, 117, 375, 1224, 4095, 13925, 48006, 167259, 588189, 2084948, 7442125, 26725125, 96485782, 350002509, 1275061385, 4662936808, 17111964241, 62996437297, 232589316700, 861028450579, 3195272504259, 11884475937910, 44295733523881, 165420418500155
(列表;图表;参考;听;历史;文本;内部格式)
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