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1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58785, 208010, 742873, 2674282, 9693840, 35351966, 129613793, 477477188, 1766446640, 6560091544, 24446776958, 91389820234, 342624437057, 1287886748877, 4852692487519, 18325298874477, 69344013520559
(list;
graph;
refs;
listen;
history;
text;
internal format)
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