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1, 3, 7, 12, 30, 99, 476, 1966, 9690, 41343, 177545, 735854, 2982553, 12147231, 49062103, 197792469, 794236626, 3176408470, 12689052371, 50613185496, 201709743301, 803183013778, 3195281754810, 12704754084829, 50492469949396, 200609143365951, 796829906416550
(list;
graph;
refs;
listen;
history;
text;
internal format)
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