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1, 2, 2, 3, 3, 9, 16, 25, 50, 83, 150, 286, 540, 975, 1865, 3515, 6588, 12620, 23835, 45486, 86811, 165822, 317770, 608517, 1170182, 2254124, 4342530, 8383468, 16197159, 31335332, 60680818, 117633364, 228260489
(list;
graph;
refs;
listen;
history;
text;
internal format)
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