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0, 0, 0, 1, 5, 20, 70, 231, 735, 2289, 7029, 21384, 64636, 194480, 583232, 1744847, 5210687, 15540023, 46299143, 137837666, 410127806, 1219804541, 3626853647, 10781440394, 32045015650, 95236794600, 283027305300, 841096898745, 2499595030581, 7428627412260
(列表;图表;参考;听;历史;文本;内部格式)
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