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1, 2, 8, 24, 69, 199, 576, 1661, 4792, 13824, 39875, 115020, 331776, 957007, 2760487, 7962624, 22968182, 66251701, 191102976, 551236370, 1590040835, 4586471424, 13229672880, 38160980055, 110075314176
(list; graph; refs; listen; history; internal format)
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