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1, 1, 1, 1, 1, 1, 2, 5, 15, 52, 204, 902, 4532, 26196, 175320, 1351296, 11819348, 115309534, 1236465988, 14419850138, 181652022376, 2462053028798, 35834756184146, 559816444117400, 9389648056139010, 169166236946379128, 3273760080403458226, 67994123544008546820
(列表;图表;参考;听;历史;文本;内部格式)
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