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1, 2, 3, 6, 11, 21, 39, 71, 130, 240, 441, 811, 1490, 2740, 5037, 9261, 17026, 31300, 57543, 105787, 194481, 357537, 657302, 1208395, 2221532, 4084101, 7508278, 13803340, 25376285, 46652176, 85766121
(list;
graph;
refs;
listen;
history;
text;
internal format)
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