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1, 23, 144, 848, 4880, 27816, 157920, 895264, 5074272, 28772280, 163262704, 927203184, 5270629104, 29988361032, 170780080320, 973422085184, 5552990609344, 31702646247768, 181128948471888, 1035584204252560
(list; graph; refs; listen; history; internal format)
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