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1, 2, 3, 6, 30, 120, 840, 3360, 13440, 134400, 739200, 6652800, 86486400, 778377600, 16345929600, 81729648000, 1389404016000, 12504636144000, 79196028912000, 1267136462592000, 81096733605888000, 3649353012264960000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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