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1, 1, 1, 3, 6, 15, 36, 90, 225, 578, 1492, 3901, 10278, 27313, 73042, 196585, 531847, 1445991, 3948282, 10823524, 29776129, 82183115, 227501127, 631494797, 1757297207, 4901491697, 13700742034, 38373104938, 107675540083, 302664162746, 852138516321
(列表;图表;参考文献;听;历史;文本;内部格式)
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