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1, 1, 3, 6, 15, 40, 113, 348, 1148, 4045, 15203, 60710, 256688, 1145887, 5386283, 26590338, 137537012, 743766652, 4196681423, 24661702224, 150676068558, 955611495432, 6281965526173, 42745748797360, 300690981532778
(list;
graph;
refs;
listen;
history;
text;
internal format)
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