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1, 1, 3, 10, 23, 66, 222, 561, 1647, 5410, 14318, 42351, 137018, 372191, 1105275, 3537540, 9772767, 29090826, 92364198, 258208671, 769820418, 2429091885, 6850744365, 20447143866, 64200928194, 182303186391, 544550917797, 1702925802766, 4861918919447
(列表;图表;参考;听;历史;文本;内部格式)
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