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1, 4, 14, 44, 144, 414, 1348, 3187, 11000, 67699, 242110, 907470, 4048716, 15792744, 61270714, 251463726, 996295359, 3916971576, 15685208519, 62232260683, 245848928006, 977038778501, 3873954187845, 15330413916232
(list;
graph;
refs;
listen;
history;
text;
internal format)
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