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1, 0, 2, 2, 13, 28, 127, 376, 1522, 5210, 20403, 74952, 292313, 1114704, 4371839, 17040586, 67378981, 266402370, 1061919289, 4241539218, 17030430061, 68554148388, 276988107861, 1121954081852, 4557637048543, 18556386241468, 75729621399950
(列表;图表;参考;听;历史;文本;内部格式)
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