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1, 3, 8, 20, 54, 147, 368, 873, 2150, 5401, 12948, 29952, 71386, 173370, 406720, 928013, 2173248, 5178906, 11994740, 27138972, 62859236, 147973950, 339831168, 764579850, 1757600988, 4102109109, 9364407584, 20984799649
(list;
graph;
refs;
listen;
history;
text;
internal format)
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