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2, 4, 12, 48, 243, 1462, 10234, 81873, 736865, 7368656, 81055217, 972662611, 12644613946, 177024595248, 2655368928725, 42485902859600, 722260348613214, 13000686275037868, 247013039225719510, 4940260784514390215
(list; graph; refs; listen; history; internal format)
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