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1, 1, 5, 17, 57, 190, 623, 2010, 6395, 20103, 62561, 193062, 591637, 1802551, 5465275, 16503365, 49665179, 149033583, 446131159, 1332749213, 3974445543, 11834777320, 35196098205, 104558824915, 310332568225, 920350334943
(list;
graph;
refs;
listen;
history;
text;
internal format)
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