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1, 2, 11, 34, 138, 492, 2342, 8500, 39814, 148124, 709266, 2665932, 12824196, 48623448, 235400988, 897705096, 4362689862, 16713200556, 81488683874, 313281535180, 1531312911148, 5903966489576, 28918583700468, 111757786454424, 548352142452124, 2123323536391448
(list;
graph;
refs;
listen;
history;
text;
internal format)
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