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1, 2, 4, 7, 12, 23, 43, 81, 151, 283, 529, 990, 1854, 3471, 6499, 12167, 22779, 42646, 79840, 149474, 279841, 523910, 980850, 1836319, 3437903, 6436343, 12049936, 22559544, 42235329, 79071768, 148035889
(list;
graph;
refs;
listen;
history;
text;
internal format)
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