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0, 1, 2, 8, 36, 180, 941, 5079, 27961, 156129, 880883, 5009625, 28668920, 164897622, 952418882, 5520254925, 32090787577, 187030223470, 1092467751427, 6393706661582, 37484034980109, 220093799592140, 1294100839792723, 7618482099893824, 44901233075819275
(列表;图表;参考文献;听;历史;文本;内部格式)
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