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1, 8, 49, 486, 5537, 55924, 523665, 4766162, 43013953, 387361440, 3486684401, 31380898558, 282429287649, 2541865457036, 22876791917137, 205891131335274, 1853020187803265, 16677181698246712, 150094635295109553
(list; graph; refs; listen; history; internal format)
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