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1, 0, 0, 0, 0, 0, 1, 4, 13, 44, 164, 666, 2943, 14075, 72491, 400020, 2354549, 14725237, 97508021, 681552735, 5014584787, 38740015633, 313536416649, 2652902840111, 23422761943259, 215418814359446, 2060451979153567, 20465943911593383, 210812000258805578, 2249048624575857158, 24821362535291019333
(列表;图表;参考;听;历史;文本;内部格式)
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