[1,3,2,5,4,3,7,6,5,4,9,8,7,6,5,11,10,9,8,7,6,13, 12,11,10,9,8,7,15,14,13,12,11,10,9,8,17,16,15,14, 13,12,11,10,9,19,18,17,16,15,14,13,12,11,10,21,20, 19,18,17,16,15,14,13,12,11]