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1, 5, 25, 121, 589, 2821, 13565, 64661, 308981, 1468313, 6989025, 33140457, 157329085, 744818613, 3529191009, 16686979329, 78955042017, 372953947349, 1762672203269, 8319554639789, 39285015083693, 185296997240401, 874331369198569
(list;
graph;
refs;
listen;
history;
text;
internal format)
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