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1, 6, 20, 48, 90, 132, 561, 2420, 10571, 46672, 207963, 934064, 4224585, 19225588, 87969426, 404479884, 1867924322, 8660317820, 40295911480, 188105782260, 880716750140, 4134823623820, 19461238795225, 91810738725036
(list; graph; refs; listen; history; internal format)
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