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1, 1, 2, 4, 11, 29, 77, 211, 582, 1618, 4539, 12805, 36306, 103400, 295576, 847661, 2437880, 7028919, 20310976, 58808175, 170577566, 495574655, 1441899589, 4200913967, 12254244406, 35786588014, 104618152761, 306135037294
(list;
graph;
refs;
listen;
history;
text;
internal format)
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