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0, 1, 4, 13, 44, 153, 544, 1965, 7185, 26536, 98822, 370593, 1398029, 5300984, 20189792, 77198271, 296202907, 1140024698, 4399918134, 17024040984, 66018733123, 256549059895, 998839762846, 3895616434744, 15217813245743, 59534874351097, 233231355731136, 914864639728729
(list;
graph;
refs;
listen;
history;
text;
internal format)
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