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1, 1, 4, 6, 12, 20, 80, 152, 304, 528, 2176, 4416, 8832, 15488, 64768, 135552, 271104, 477440, 2013184, 4289536, 8579072, 15144960, 64200704, 138407936, 276815872, 489431040, 2082406400, 4526702592, 9053405184, 16024403968
(list; graph; refs; listen; history; internal format)
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