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1, 1, 2, 6, 22, 86, 336, 1282, 4758, 17234, 61242, 214594, 744594, 2566594, 8809442, 30157826, 103082050, 352045314, 1201795970, 4101913602, 13999868162, 47782800386, 163095158274, 556717514754, 1900427035650, 6487635578882, 22148113283074, 75613356769282
(列表;图表;参考;听;历史;文本;内部格式)
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