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1, 0, 0, 4, 6, 18, 46, 132, 408, 1254, 4110, 13440, 46420, 160428, 572706, 2057252, 7544784, 27882252, 104455308, 394319118, 1503100560, 5768874688, 22304692368, 86749353342, 339380104380, 1334443604172, 5272470030306
(list;
graph;
refs;
listen;
history;
text;
internal format)
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