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0, 2, 6, 18, 52, 146, 406, 1126, 3124, 8684, 24202, 67640, 189576, 532786, 1501254, 4240550, 12005780, 34063896, 96844082, 275848044, 787104288, 2249633916, 6439678858, 18460717684, 52994100984, 152323413890, 438363476086
(list; graph; refs; listen; history; internal format)
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