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1, 1, 1, 2, 6, 24, 120, 720, 5040, 20160, 120960, 907200, 7983360, 79833600, 889574400, 10897286400, 81729648000, 871782912000, 11115232128000, 160059342643200, 2534272925184000, 43444678717440000, 798295971432960000, 8781255685762560000, 134645920515025920000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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