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1, 2, 6, 24, 120, 720, 4320, 22920, 112056, 525642, 2441314, 11467387, 55213453, 269051424, 1315752712, 6425315520, 31265476224, 151611449472, 733893891840, 3552247523904, 17205089767968, 83394449973808, 404426778909176
(list;
graph;
refs;
listen;
history;
text;
internal format)
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