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2, 10, 60, 343, 1968, 11319, 65351, 378690, 2201772, 12839896, 75076505, 440016174, 2584289200, 15206283135, 89625150180, 529040216175, 3127061645796, 18506252646420, 109644576096980, 650280444390382
(list;
graph;
refs;
listen;
history;
text;
internal format)
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