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1, 7, 30, 119, 467, 1820, 7076, 27493, 106848, 415538, 1617504, 6302416, 24581249, 95968478, 375029576, 1466881997, 5742440324, 22498218218, 88212326756, 346114729562, 1358944775654, 5338963361408, 20987909276600
(list; graph; refs; listen; history; internal format)
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