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0, 1, 2, 9, 47, 272, 1685, 10939, 73462, 506111, 3557109, 25404296, 183834627, 1344987117, 9932411282, 73937697965, 554234827675, 4179895359240, 31693701617841, 241467983156655, 1847602171074502, 14191725625366331, 109390959408760713
(list;
graph;
refs;
listen;
history;
text;
internal format)
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