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6, 21, 69, 219, 681, 2091, 6369, 19299, 58281, 175611, 528369, 1588179, 4770681, 14324331, 42997569, 129041859, 387223881, 1161868251, 3485997969, 10458780339, 31377913881, 94136887371, 282416953569, 847263443619, 2541815496681, 7625496821691, 22876591128369
(list;
graph;
refs;
listen;
history;
text;
internal format)
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