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1, 2, 6, 25, 127, 766, 5365, 42920, 386283, 3862837, 42491212, 509894549, 6628629137, 92800807920, 1392012118804, 22272193900878, 378627296314936, 6815291333668857, 129490535339708300, 2589810706794166014
(list; graph; refs; listen; history; internal format)
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