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1, 10, 66, 365, 1837, 8741, 40133, 179932, 793605, 3460106, 14961664, 64306917, 275180827, 1173714565, 4994096327, 21211537533, 89972566673, 381261067469, 1614446775255, 6832832045575, 28908094009481, 122272843951891, 517095189163181
(list; graph; refs; listen; history; internal format)
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