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5, 17, 42, 121, 351, 978, 2768, 7851, 22168, 62688, 177333, 501398, 1417871, 4009693, 11338691, 32064185, 90673442, 256411571, 725096165, 2050472356, 5798450868, 16397214669, 46369052496, 131125251872, 370804035439, 1048582421408
(列表;图表;参考;听;历史;文本;内部格式)
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