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0, 0, 0, 0, 1, 7, 34, 141, 537, 1942, 6786, 23143, 77513, 256021, 836330, 2707652, 8701723, 27793375, 88310920, 279354069, 880300371, 2764788010, 8658249900, 27045078415, 84287831231, 262161737197, 813944768564, 2523027912296, 7809442203157, 24140652097687
(列表;图表;参考;听;历史;文本;内部格式)
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