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0, 4, 9, 30, 111, 355, 1257, 4357, 15146, 53379, 187699, 663631, 2352610, 8356208, 29754352, 106127185, 379166226, 1356700796, 4860763378, 17436188166, 62613987171, 225072940410, 809789751003, 2915986488761, 10508369260118, 37896284981596, 136756217644237, 493817776063606
(list;
graph;
refs;
listen;
history;
text;
internal format)
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