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1, 2, 8, 32, 156, 820, 4744, 29544, 196708, 1388012, 10320096, 80474620, 655800496, 5569011668, 49164525468, 450312766892, 4271622415228, 41898174547952, 424319014633656, 4431086950025056, 47656288619258248, 527272509796024344
(list;
graph;
refs;
listen;
history;
text;
internal format)
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