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