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4, 12, 34, 96, 262, 706, 1866, 4876, 12590, 32220, 81780, 206182, 516682, 1288100, 3196414, 7899664, 19452002, 47741832, 116827972, 285121530, 694145540, 1686165640, 4087501476, 9889956114, 23887544730, 57602999360, 138696210062, 333483756402, 800784138674, 1920539773188, 4600776445384, 11009534409116, 26318680827474, 62855267076802, 149976974496002, 357547693790338, 851705230512838, 2027255882196068
(列表;图表;参考;听;历史;文本;内部格式)
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