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2, 5, 15, 61, 307, 1845, 12917, 103339, 930059, 9300596, 102306556, 1227678673, 15959822761, 223437518655, 3351562779829, 53625004477268, 911625076113560, 16409251370044092, 311775776030837765, 6235515520616755313
(list;
graph;
refs;
listen;
history;
text;
internal format)
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