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1, 2, 4, 9, 20, 44, 96, 209, 456, 998, 2188, 4797, 10508, 22998, 50300, 109925, 239888, 522294, 1133548, 2450853, 5277428, 11317522, 24175780, 51455011, 109151272, 230849188, 486943160, 1024797729, 2152642748, 4514814294, 9457734492, 19793953547
(list;
graph;
refs;
listen;
history;
text;
internal format)
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