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1, 1, 3, 11, 37, 131, 481, 1778, 6637, 25010, 94819, 361275, 1382507, 5309449, 20452432, 78991548, 305779341, 1186056909, 4608647096, 17936112649, 69903546693, 272788289379, 1065751393409, 4168163479770, 16317475606787
(list; graph; refs; listen; history; internal format)
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