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1, 1, 4, 21, 124, 786, 5228, 36005, 254568, 1837214, 13479308, 100239418, 753880440, 5724153044, 43820345784, 337850230061, 2621033435856, 20445810352950, 160271222750348, 1261838520251886, 9973780991950168, 79115475268744044, 629605388017281768, 5025263773704414050
(列表;图表;参考;听;历史;文本;内部格式)
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