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1, 1, 2, 5, 14, 42, 131, 427, 1413, 4784, 16416, 57042, 200151, 708109, 2522559, 9039042, 32550884, 117725760, 427372532, 1556523664, 5685148711, 20816785068, 76390832952, 280874946775, 1034505345468, 3816077176898, 14095932284899, 52131389039054
(list;
graph;
refs;
listen;
history;
text;
internal format)
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