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1, 1, 1, 1, 2, 4, 8, 17, 39, 93, 227, 567, 1447, 3760, 9917, 26492, 71567, 195256, 537397, 1490614, 4163508, 11702411, 33078992, 93986117, 268294604, 769171970, 2213834911, 6395017291, 18534987580, 53887644375, 157121564325, 459351495858, 1346290327899
(列表;图表;参考;听;历史;文本;内部格式)
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