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1, 5, 30, 151, 698, 2896, 11053, 38865, 127339, 390781, 1131055, 3102493, 8105244, 20247770, 48548878, 112089790, 249930985, 539592972, 1130655414, 2304230739, 4575993619, 8870692319, 16812222795, 31196614962, 56750633235
(list; graph; refs; listen; history; internal format)
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