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1, 1, 1, 2, 3, 7, 13, 31, 66, 160, 369, 907, 2191, 5461, 13558, 34209, 86426, 220359, 563475, 1449282, 3739365, 9688104, 25173917, 65621067, 171498288, 449361649, 1180078602, 3105740797, 8189749105, 21636207962, 57257857968, 151771200002, 402899862910, 1071076810324, 2851165864937
(列表;图表;参考;听;历史;文本;内部格式)
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