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1, 2, 5, 14, 43, 144, 525, 2084, 9005, 42288, 215111, 1179738, 6937765, 43504598, 289356385, 2031636826, 14995775647, 115943399636, 936138957225, 7872233481696, 68788474572625, 623323010473012, 5846701373312019
(list;
graph;
refs;
listen;
history;
text;
internal format)
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