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1, 3, 8, 20, 55, 148, 400, 1086, 2948, 8000, 21716, 58945, 160000, 434307, 1178891, 3200000, 8686137, 23577802, 64000000, 173722728, 471556032, 1280000000, 3474454550, 9431120637, 25600000000, 69489090985, 188622412731, 512000000000, 1389781819697
(列表;图表;参考;听;历史;文本;内部格式)
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