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1, 3, 14, 56, 280, 1872, 11760, 104832, 1224720, 12545280, 96526080, 1163289600, 13891046400, 200222668800, 2917119744000, 47259168768000, 738275586048000, 13386781384704000, 259936372452556800, 5427242941317120000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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