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1, 3, 10, 84, 852, 11580, 197640, 4314240, 100855440, 3342895920, 98070406560, 4652556511680, 163444377096000, 10568979882901440, 431650452829115520, 36599310178253222400, 1702185892636880851200, 183500657952824967955200, 9569677207227878912371200
(list;
graph;
refs;
listen;
history;
text;
internal format)
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