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1, 1, 2, 6, 30, 174, 1284, 11148, 110604, 1215180, 15066936, 205333416, 3031876872, 48536481096, 834192650160, 15357616617744, 301627633467024, 6274718094035088, 137885714638938144, 3199063553591292000, 77943291010448903136, 1991687512094232297696
(list;
graph;
refs;
listen;
history;
text;
internal format)
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