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1, 4, 17, 58, 199, 682, 2301, 7654, 25145, 81740, 263407, 842720, 2679935, 8479378, 26713555, 83847748, 262335577, 818473148, 2547289679, 7910433568, 24517303535, 75854736178, 234317624167, 722776320072, 2226565995913
(list; graph; refs; listen; history; internal format)
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