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2, 4, 12, 49, 245, 1470, 10295, 82362, 741264, 7412647, 81539127, 978469535, 12720103955, 178081455373, 2671221830606, 42739549289708, 726572337925041, 13078302082650740, 248487739570364075, 4969754791407281515
(list; graph; refs; listen; history; internal format)
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