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1, 1, 2, 5, 14, 42, 132, 429, 1430, 4861, 16785, 58708, 207557, 740520, 2662812, 9640581, 35112513, 128563215, 472951884, 1747233370, 6479450415, 24111470952, 90006390290, 336953657070, 1264770431964, 4758911027946, 17946417454046, 67818937355227, 256781370248500
(列表;图表;参考;听;历史;文本;内部格式)
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