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1, 2, 11, 52, 200, 742, 3532, 18216, 80728, 331320, 1567106, 8014124, 36841482, 158071146, 751787936, 3820895710, 17829567326, 78319157796, 374296581082, 1895330556506, 8917324246030, 39744514627938, 190602503862906, 962726903486410, 4553648018091836, 20499468905835742
(list;
graph;
refs;
listen;
history;
text;
internal format)
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