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1, 2, 4, 19, 60, 237, 850, 3252, 12168, 46497, 177052, 679745, 2612226, 10079515, 38961906, 150982379, 586067980, 2278999145, 8874984360, 34609160383, 135125659144, 528166347564, 2066529185116, 8093134894351
(list;
graph;
refs;
listen;
history;
text;
internal format)
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