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1, 1, 1, 2, 2, 5, 16, 68, 244, 1106, 4041, 15802, 60716, 234319, 885466, 3369738, 12612488, 47251424, 174691216, 644760884, 2353213266, 8557977690, 30825999521, 110546795278, 393117952349, 1390864413489, 4884724958228, 17059662985333
(list;
graph;
refs;
listen;
history;
text;
internal format)
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