[1,1,2,3,2,4,3,5,6,4,7,8,5,6,9,10,7,11,8,12,13,14, 9,15,10,16,17,11,18,19,12,13,20,14,21,22,15,23,24, 16,17,25,26,18,27,19,28,29,30,20,31,32,21,33,22, 34,35,23,24,36,37,38,39,25,26,40]