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1, 2, 6, 16, 44, 116, 294, 748, 1794, 4352, 10072, 23496, 52862, 118820, 261214, 569604, 1228220, 2601164, 5495022, 11344842, 23610090, 47656726, 97354662, 192295578, 388117650, 753393744, 1495849616, 2851455044, 5606303284
(list;
graph;
refs;
listen;
history;
text;
internal format)
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