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0, 0, 2, 6, 17, 47, 128, 349, 948, 2579, 7011, 19058, 51806, 140824, 382800, 1040560, 2828536, 7688760, 20900217, 56812680, 154432878, 419792086, 1141113200, 3101867275, 8431749450, 22919871312, 62302669700, 169356214910, 460357921527
(list; graph; refs; listen; history; internal format)
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