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1, 4, 14, 48, 166, 579, 2037, 7226, 25831, 92988, 336872, 1227400, 4495191, 16540013, 61116635, 226700190, 843851715, 3151174800, 11802018060, 44321634960, 166863174240, 629665197174, 2381173300698, 9022761052340
(list;
graph;
refs;
listen;
history;
text;
internal format)
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