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1, 2, 8, 30, 138, 562, 2700, 11364, 55756, 238874, 1186616, 5140518, 25745026, 112379472, 566088616, 2484706008, 12570242776, 55405777178, 281236520744, 1243692265890, 6329700657110, 28065758573186, 143148739542708, 636106122212964
(list;
graph;
refs;
listen;
history;
text;
internal format)
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