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1, 4, 14, 48, 170, 611, 2214, 8135, 30171, 112589, 423114, 1598998, 6068246, 23125097, 88441638, 339234219, 1304756453, 5030574435, 19436510637, 75241443220, 291780678294, 1133270649257, 4407906226851, 17167267446803
(list;
graph;
refs;
listen;
history;
text;
internal format)
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