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1, 2, 7, 21, 57, 162, 452, 1255, 3474, 9621, 26604, 73531, 203166, 561242, 1550216, 4281502, 11824338, 32654467, 90177615, 249028277, 687692923, 1899056307, 5244202459, 14481714130, 39990771798, 110433069740, 304956719409, 842126002534
(列表;图表;参考;听;历史;文本;内部格式)
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