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1, 1, 2, 5, 12, 30, 80, 236, 782, 2872, 11551, 50208, 233475, 1153424, 6022129, 33094892, 190798443, 1150698311, 7241821945, 47455029775, 323155438297, 2282781968327, 16700909857189, 126356647220803, 987303496571557, 7957134024398329, 66071773173223712
(list;
graph;
refs;
listen;
history;
text;
internal format)
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