[1,2,2,4,3,3,6,6,4,4,9,8,8,5,5,12,12,10,10,6,6,16, 15,15,12,12,7,7,20,20,18,18,14,14,8,8,25,24,24,21, 21,16,16,9,9,30,30,28,28,24,24,18,18,10,10,36,35, 35,32,32,27,27,20,20,11,11,42,42,40,40,36,36,30, 30,22,22,12,12]