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1, 2, 3, 7, 38, 66, 293, 1144, 5452, 22610, 89617, 370658, 1495184, 5933517, 23790663, 94871091, 376066283, 1494417598, 5930990794, 23487622433, 93066819110, 368664549287, 1459293473323, 5777177019563, 22871054333027
(list; graph; refs; listen; history; internal format)
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