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1, 1, 2, 5, 14, 42, 133, 433, 1455, 4958, 17247, 60502, 215353, 770865, 2789365, 10134529, 37130526, 136451349, 504837219, 1872121732, 6980767968, 26078614284, 97872756530, 367861581953, 1388061197005, 5243972732886
(list;
graph;
refs;
listen;
history;
text;
internal format)
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