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0, 2, 6, 20, 68, 230, 776, 2604, 8670, 28606, 93494, 302748, 971810, 3094486, 9782092, 30721056, 95919714, 297938906, 921183940, 2836545972, 8702745304, 26614653494, 81159163058, 246855070144, 749123740876, 2268700324802
(list; graph; refs; listen; history; internal format)
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