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1, 1, 3, 6, 15, 31, 74, 159, 365, 805, 1817, 4035, 9072, 20221, 45328, 101263, 226767, 507067, 1135206, 2539827, 5685851, 12725874, 28491634, 63785789, 142828392, 319826118, 716260116, 1604170013, 3593139239, 8048694851, 18030750419, 40395321587, 90506748160
(列表;图表;参考;听;历史;文本;内部格式)
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