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1, 1, 3, 16, 135, 944, 4814, 26435, 158761, 978044, 5847896, 34112584, 200686378, 1192024482, 7093151801, 42038865123, 248625856115, 1472077262971, 8724918986240, 51715149361624, 306384777098954, 1814848220902299, 10751681585808618, 63702848673263049
(list;
graph;
refs;
listen;
history;
text;
internal format)
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