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1, 1, 2, 4, 9, 21, 55, 146, 413, 1194, 3553, 10756, 33134, 103273, 325484, 1034734, 3314870, 10688513, 34662777, 112976023, 369876832, 1215811262, 4010932603, 13275356936, 44070010202, 146698487202, 489550622528
(list;
graph;
refs;
listen;
history;
text;
internal format)
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