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1, 2, 3, 7, 21, 41, 178, 743, 1893, 7141, 40686, 242045, 734858, 3426541, 16135967, 125737204, 1002664205, 3666743533, 19447711462, 106460517281, 670516591350, 6612951841507, 70889373855917, 294866473433284, 1838126653955566, 10943388725636241, 76804122461785213
(列表;图表;参考;听;历史;文本;内部格式)
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