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1, 2, 6, 21, 81, 334, 1428, 6283, 28204, 128605, 593492, 2765382, 12986012, 61373153, 291608306, 1391797307, 6668339795, 32054662762, 154527631682, 746801740045, 3617079719503, 17553133963549, 85330109635389, 415453019286677, 2025562898443804, 9888154841078525, 48325878436856862, 236425857821312468
(列表;图表;参考;听;历史;文本;内部格式)
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