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1, 4, 13, 40, 120, 352, 1022, 2948, 8473, 24304, 69649, 199544, 571795, 1639244, 4702499, 13500396, 38790727, 111555296, 321100627, 925086012, 2667533646, 7698716068, 22238169212, 64289860528, 186010834243, 538611262492
(list;
graph;
refs;
listen;
history;
text;
internal format)
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