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1, 1, 1, 1, 2, 3, 6, 11, 24, 51, 120, 283, 716, 1833, 4948, 13561, 38788, 112745, 339676, 1039929, 3283876, 10532747, 34717276, 116158851, 398257012, 1385117947, 4925094508, 17752742867, 65297807204, 243319812785, 923739847132, 3550638576721, 13885783706324
(列表;图表;参考;听;历史;文本;内部格式)
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