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1, 1, 5, 25, 115, 485, 1875, 6655, 21755, 65800, 185169, 487763, 1209978, 2843009, 6360875, 13616713, 28008865, 55567799, 106683637, 198787805, 360428177, 637343681, 1101362043, 1863225539, 3090808955, 5034648646, 8063271761, 12711523735, 19745967040
(列表;图表;参考;听;历史;文本;内部格式)
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