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1, 1, 2, 5, 16, 64, 308, 1727, 11008, 78244, 611060, 5184338, 47366320, 462782080, 4807659368, 52853722811, 612426360832, 7453621425532, 94997205901940, 1264555335831662, 17540102647480336, 252979919852470672, 3786896497867089656, 58733519954606892278, 942372338052077455168
(list;
graph;
refs;
listen;
history;
text;
internal format)
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