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1, 7, 47, 307, 1967, 12427, 77687, 481747, 2968607, 18202267, 111166727, 676765987, 4109424047, 24900684907, 150624812567, 909852391027, 5489631924287, 33090379436347, 199305216071207, 1199645993692867
(list; graph; refs; listen; history; internal format)
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