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1, 1, -1, 2, -5, 13, -40, 126, -409, 1363, -4617, 15896, -55444, 195480, -695636, 2495118, -9011281, 32741839, -119601339, 438968354, -1618006837, 5986803522, -22229028994, 82798248894, -309299225632, 1158483827048, -4349740078410, 16368842606820, -61727972554068, 233233590724532, -882851162632794, 3347489178793192, -12712739206990305
(列表;图表;参考;听;历史;文本;内部格式)
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