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1, 0, 2, 4, 8, 20, 44, 100, 228, 516, 1172, 2660, 6036, 13700, 31092, 70564, 160148, 363460, 824884, 1872100, 4248788, 9642756, 21884532, 49667620, 112722196, 255826500, 580606132, 1317703524, 2990568788, 6787188100, 15403732724, 34959246500, 79341088148, 180067046596
(列表;图表;参考;听;历史;文本;内部格式)
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