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1, 3, 5, 12, 21, 60, 145, 461, 1455, 4920, 16825, 58937, 208049, 743218, 2674539, 9695792, 35357723, 129647876, 477638761, 1767273109, 6564120913, 24466300714, 91482563719, 343059732922, 1289904147511, 4861946817610
(list;
graph;
refs;
listen;
history;
text;
internal format)
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