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0, 0, 0, 1, 5, 18, 56, 160, 432, 1121, 2827, 6988, 17052, 41334, 100082, 243205, 595313, 1471278, 3674756, 9272410, 23605202, 60513201, 155893167, 402819550, 1042358942, 2697994240, 6979913196, 18041181065, 46583002021, 120161923640, 309719942306
(列表;图表;参考;听;历史;文本;内部格式)
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