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1, 3, 10, 44, 174, 822, 3414, 16604, 70600, 348828, 1503802, 7504156, 32645122, 164014374, 718098056, 3625748104, 15950473396, 80839381968, 356946436186, 1814421022372, 8035178656538, 40941855317034, 181746522965214, 927880523400340
(list; graph; refs; listen; history; internal format)
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