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2, 10, 38, 158, 714, 3378, 16366, 80326, 397202, 1972826, 9824694, 49005294, 244672090, 1222297474, 6108298622, 30531927062, 152630937378, 763068593322, 3815084686150, 19074648589630, 95370918425066, 476847618556370
(list; graph; refs; listen; history; internal format)
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