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1, 6, 24, 94, 356, 1338, 5036, 18942, 71264, 268114, 1008728, 3795162, 14278632, 53720914, 202115688, 760425734, 2860971568, 10763916406, 40497394188, 152364521390, 573245456832, 2156738015294, 8114358001856, 30528884544598, 114859708062884, 432140012215626
(列表;图表;参考;听;历史;文本;内部格式)
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