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1, 1, 2, 3, 8, 15, 39, 77, 216, 459, 1265, 2739, 7842, 17641, 49854, 113175, 327604, 761787, 2182833, 5101595, 14868582, 35338401, 102146176, 243510453, 713019480, 1721265625, 5005198029, 12105626337, 35565979706, 86870058279, 253706973975, 620415879229, 1827423157812, 4504531840875, 13199126952109
(列表;图表;参考;听;历史;文本;内部格式)
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