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0, 1, 1, 2, 5, 12, 33, 94, 290, 949, 3245, 11666, 43731, 170748, 689957, 2887816, 12458783, 55406276, 253142181, 1187931688, 5712032811, 28131119950, 141645386201, 728841245442, 3827217750406, 20499431084637, 111876916513388, 621831333931916, 3516904353610571
(列表;图表;参考;听;历史;文本;内部格式)
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