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1, 1, 2, 10, 14, 56, 202, 715, 3244, 12945, 49742, 188306, 758110, 2995837, 11692368, 45296460, 178695558, 703699430, 2760976698, 10798499630, 42480767744, 167242631953, 657890399440, 2585002312353, 10177799881606
(list;
graph;
refs;
listen;
history;
text;
internal format)
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