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1, 2, 6, 24, 120, 600, 3000, 15000, 68856, 302730, 1315666, 5767051, 25794781, 116409504, 526500664, 2378347800, 10719053952, 48224952000, 216718943232, 973508319552, 4374436760256, 19666053717664, 88443958762248
(list;
graph;
refs;
listen;
history;
text;
internal format)
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