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1, 2, 3, 6, 13, 30, 74, 196, 555, 1666, 5269, 17476, 60539, 218277, 816718, 3163136, 12652545, 52167780, 221329146, 964751381, 4314499339, 19771519807, 92736648099, 444749340320, 2178817894447, 10894089472236, 55549174801758
(list;
graph;
refs;
listen;
history;
text;
internal format)
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