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2, 6, 19, 61, 197, 633, 2036, 6548, 21061, 67737, 217861, 700699, 2253638, 7248306, 23312507, 74979305, 241153657, 775615161, 2494587424, 8023265560, 25804984685, 82995786381, 266936820209, 858540765611
(list; graph; refs; listen; history; internal format)
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